Persons
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| Surname, Forenames | War | Regiment / Service | Site | Memorial |
|---|---|---|---|---|
| Mackey, Thomas (Mac Aoda, Thom? | W. of I. | Irish Republican Army | Kilcrumper, Fermoy | Kilcrumper Memorial |
| MacNamara, Edward | W. of I. | Irish Republican Army 4th Battalion, Cork No. 1 Brigade | Midleton, Main Street | Midleton I.R.A. Memorial |
| MacSwiney, Terence | W. of I. | Not stated | Cork, City Hall | Terence MacSwiney Memorial |
| MacSwiney, Terence | W. of I. | Irish Republican Army Cork No. 1 Brigade | Cork, City Hall | Terence MacSwiney Memorial(2) |
| MacTremfir, Tomas | W. of I. | Irish Republican Army | Dublin 02, Pearse Street, No. 144 | IRA Memorial |
| Madigan, Daniel | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| Madigan, T. | W. of I. | Irish Republican Army | Moroe | Limerick Brigades Memorial |
| Madigan, Tim (Tadg Ó Madagáin) | W. of I. | Irish Republican Army | Newcastlewest, St. Ita's Road | Newcastlewest 1916-1922 Memorial |
| Magee, Herbert | W. of I. | Irish Guards | Newcastle, St. John's Church | World War II Roll of Honour |
| Magee, Robert | W. of I. | Civilian (includes clergy, fire services and medics) | Dublin 13, Sutton Lawn Tennis Club | Henry Guy Memorial |
| Magner, Thomas, Fr. | W. of I. | Civilian (includes clergy, fire services and medics) | Dunmanway, Ballineen Road | Magner and Crowley Memorial |
| Maher, P. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| Maher, Patrick | W. of I. | Irish Republican Army | Galbally | Galbally Memorial |
| Maher, Patrick | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| Maher, Patrick | W. of I. | Irish Republican Army | Dublin 11, Glasnevin Cemetery | Mountjoy Ten Memorial |
| Maher, Patrick (Pádraig Ó Meachair) | W. of I. | Irish Volunteers | Ballylanders | Ballylanders 1916-1921 Memorial |
| Maher, R. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| Mangan, Patrick | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| Mangan, Patrick (?hAnnag?, P?aig) | W. of I. | Irish Republican Army | Kilcrumper, Fermoy | Kilcrumper Memorial |
| Manning, George | W. of I. | Irish Republican Army Athlone Brigade, I.R.A. | Athlone, Custume Place | Athlone Brigade I.R.A. Memorial |
| Mannion, Patrick | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| Mannion, Thomas (Toby) | W. of I. | Irish Republican Army Athlone Brigade, I.R.A. | Athlone, Custume Place | Athlone Brigade I.R.A. Memorial |
| Mannion, Toby | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| Markiewicz, Countess | W. of I. | Not stated | Dublin 01, Gardiner Row, No. 6 | Dublin Brigade I.R.A. Memorial |
| Martin, Michael | W. of I. | Irish Republican Army | Sheemore | I.R.A. Memorial |
| Maunsell, David (or Daniel) | W. of I. | Police R.I.C. | Cork, Public Museum | Macroom Auxiliary R.I.C. Memorial |
| McCan, Pierse | W. of I. | Irish Volunteers | Templemore, The Square | McCan Memorial |
| McCann, John (Seán Mac Canna) | W. of I. | Irish Republican Army | Rush, Quay Road | McCann Memorial |
| McCann, P. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| McCanny, Bernard | W. of I. | Irish Republican Army | Pettigo, Main Street | War of Independence Memorial |
| McCarthy, Dave | W. of I. | Irish Republican Army Kerry No. 2 Brigade Flying Column | Kenmare, The Square | Kenmare War of Independence Memorial |
| McCarthy, Michael (Mícheál MacCarthaigh) | W. of I. | Irish Republican Army 3rd. Battalion, 3rd. Cork Brigade | Kilmurry, Independence Museum | Kilmichael Ambush Memorial |
| McCarthy, Nellus | W. of I. | Irish Republican Army Kerry No. 2 Brigade Flying Column | Kenmare, The Square | Kenmare War of Independence Memorial |
| McCarthy, Patrick | W. of I. | Irish Republican Army 2nd. Btn., 4th Cork Brigade | Millstreet, The Square | Millstreet I.R.A. Memorial |
| McCarthy, Timothy | W. of I. | Irish Republican Army | Donoughmore Cemetery | Donoughmore Cemetery I.R.A. Memorial |
| McCarthy, Timothy (Mac Carthaigh, Tadhg) | W. of I. | Irish Republican Army | Dripsey | Dripsey Memorial |
| McCormac, James | W. of I. | Irish Republican Army | Banagher | McCormac and Barnes Memorial |
| McCormack, - | W. of I. | Irish Republican Army | Soloheadbeg | Soloheadbeg Memorial |
| McCormack, Bernard | W. of I. | Irish Volunteers Athlone Brigade, I.R.A. | Athlone, Custume Place | Athlone Brigade I.R.A. Memorial |
| McDermott, Stephen | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| McDonagh, P. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| McDonagh, Thomas | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| McDonnell, Padraig | W. of I. | Irish Republican Army | Oldcastle | Cogan and McDonnell Memorial |
| McDonnell, Tom | W. of I. | Civilian (includes clergy, fire services and medics) | Corracunna | Corracunna Memorial |
| McDowell, John | W. of I. | Irish Republican Army North Longford Flying Column | Clonfin | Clonfin Ambush Memorial |
| McDowell, Robert | W. of I. | Royal Irish Regiment | Dollingstown | Dollingstown War Memorial |
| McEllistrim, Tom | W. of I. | Irish Republican Army Kerry No. 2 Brigade Flying Column | Kenmare, The Square | Kenmare War of Independence Memorial |
| McEnry, Donal (Domhnall Mac Innéirí) | W. of I. | Irish Republican Army | Newcastlewest, St. Ita's Road | Newcastlewest 1916-1922 Memorial |
| McEntyre, Seán | W. of I. | Irish Republican Army | Cavan Courthouse | Cavan I.R.A. Memorial |
| McEoin, Sean | W. of I. | Irish Republican Army North Longford Flying Column | Clonfin | Clonfin Ambush Memorial |
| McGlynn, Terence | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| McGoohan, C. E. | W. of I. | Irish Republican Army | Sheemore | I.R.A. Memorial |
| McGowan, John | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| McGowan, John | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| McGrath, Dan | W. of I. | Civilian (includes clergy, fire services and medics) | Corracunna | Corracunna Memorial |
| McGrath, Joseph | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| McGrath, M. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| McGrath, M. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| McGrath, Michael | W. of I. | Irish Republican Army | Ballinattin | Ballinattin Memorial |
| McGrath, Patrick | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| McIntosh, James | W. of I. | Irish Republican Army | Deansgrange Cemetery | Republican Roll of Honour |
| McKee, Dick | W. of I. | Irish Republican Army | Dublin 02, off Dame Street | McKee Clancy Clune Memorial |
| McKee, Dick | W. of I. | Irish Republican Army Dublin Brigade | Dublin 01, Seán MacDermott Street, No. 36 | McKee, Clancy and Clune Memorial |
| McKee, Dick | W. of I. | Not stated | Dublin 11, Finglas, Casement Road | Liam Mellows Memorial |
| McKee, Richard (Dick) | W. of I. | Irish Republican Army Dublin Brigade | Dublin 11, Finglas Main Street | McKee Memorial |
| McKeon, Harry | W. of I. | Irish Republican Army | Sheemore | I.R.A. Memorial |
| McKeown, Christopher | W. of I. | Irish Republican Army Athlone Brigade, I.R.A. | Athlone, Custume Place | Athlone Brigade I.R.A. Memorial |
| McLean, Michael, (MacLéin, Mícheál) | W. of I. | Irish Republican Army 5th Cork Brigade | Bantry Tourist Office | Bantry I.R.A. Memorial |
| McMahan, Joseph | W. of I. | Irish Republican Army | Cavan Courthouse | Cavan I.R.A. Memorial |
| McMahon, Michael (Mícheál MacMachghamhna) | W. of I. | Irish Republican Army | Killaloe Bridge | Killaloe I.R.A. Memorial |
| McStay, Michael | W. of I. | Irish Republican Army North Longford Flying Column | Ballinalee | Ballinalee Memorial |
| McVey, John | W. of I. | Irish Republican Army North Longford Flying Column | Ballinalee | Ballinalee Memorial |
| Meaney, Paddy | W. of I. | Irish Republican Army 6th Bttn. | Ballybrack, 1, Madden's Lane | Dunne and Meaney Memorial |
| Michael Egan (Mícheál MacAodaghan) | W. of I. | Irish Republican Army | Killaloe Bridge | Killaloe I.R.A. Memorial |
| Miranda, John | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| Mitchell, John | W. of I. | Irish Republican Army | Sheemore | I.R.A. Memorial |
| Mitchell, L. R. | W. of I. | Police Auxiliary R.I.C. | Cork, Public Museum | Macroom Auxiliary R.I.C. Memorial |
| Molloy, Brian (Brían Ó Maoildhia) | W. of I. | Not stated | Castlegar | Castlegar Republican Memorial |
| Molloy, Joseph | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| Molloy, Joseph | W. of I. | Civilian (includes clergy, fire services and medics) | Ardcarne Church | Ardcarne War Memorial |
| Moloney, Eamonn | W. of I. | Irish Republican Army | Bruff | Bruff Memorial |
| Moloney, P. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| Monds, James | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| Moore, Jack | W. of I. | Irish Republican Army North Longford Flying Column | Clonfin | Clonfin Ambush Memorial |
| Moore, Maurice | W. of I. | Irish Republican Army | Midleton, Holy Rosary Church | Cork No. 1 Brigade Memorial |
| Moore, Maurice | W. of I. | Irish Republican Army | Clonmult | Clonmult Village Memorial |
| Moore, Maurice | W. of I. | Irish Republican Army 4th Battalion, Cork No. 1 Brigade | Midleton, Main Street | Midleton I.R.A. Memorial |
| Moorehouse, John | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| Moran, Francis | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| Moran, Patrick | W. of I. | Irish Volunteers ( also, I.R.A.) | Dún Laoghaire, DLR Lexicon | Patrick Moran Memorial |
| Moran, Patrick | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| Moran, Patrick | W. of I. | Irish Republican Army | Dublin 11, Glasnevin Cemetery | Mountjoy Ten Memorial |
| Moran, Patrick | W. of I. | Irish Republican Army | Ardcarne Church | Ardcarne War Memorial |
| Moran, Thomas | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| Morrisey, Joseph (Joe) | W. of I. | Irish Republican Army Athlone Brigade, I.R.A. | Athlone, Custume Place | Athlone Brigade I.R.A. Memorial |
| Morrissey, Joseph | W. of I. | Irish Republican Army | Clonmult Ambush Site | Clonmult Ambush Site Memorial |
| Morrissey, Joseph | W. of I. | Irish Republican Army | Clonmult | Clonmult Village Memorial |
| Morrissey, Joseph | W. of I. | Irish Republican Army 4th Battalion, Cork No. 1 Brigade | Midleton, Main Street | Midleton I.R.A. Memorial |
| Morrissey, Patrick | W. of I. | Irish Republican Army 4th Battalion, Cork No. 1 Brigade | Midleton, Main Street | Midleton I.R.A. Memorial |
| Moynihan, Bernard | W. of I. | Irish Republican Army 1st. Btn., 4th Cork Brigade | Millstreet, The Square | Millstreet I.R.A. Memorial |
| Mulcahy, Arthur (O Maolcatha, Artur) | W. of I. | Irish Republican Army | Kilcrumper, Fermoy | Kilcrumper Memorial |
| Mulcahy, Thomas | W. of I. | Irish Republican Army | Knockmourne, Mallow | Mourne Abbey Memorial |
| Mulcahy, William | W. of I. | Irish Republican Army | Knockmourne, Mallow | Mourne Abbey Memorial |
| Mulligan, make | W. of I. | Irish Republican Army North Longford Flying Column | Clonfin | Clonfin Ambush Memorial |
| Mullooly, Michael | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| Mulrennan, Patrick | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| Mulrennan, Seamus | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| Mulrooney, Bill | W. of I. | Irish Republican Army B Coy, 8th Btn, | Dunnamaggin | Dunnamaggin Memorial |
| Mulrooney, Pat | W. of I. | Irish Republican Army B Coy, 8th Btn, | Dunnamaggin | Dunnamaggin Memorial |
| Mulrooney, Tom | W. of I. | Irish Republican Army B Coy, 8th Btn, | Dunnamaggin | Dunnamaggin Memorial |
| Murphy (Tomás O'Murchadha) | W. of I. | Irish Volunteers | Ballylanders | Ballylanders 1916-1921 Memorial |
| Murphy, Con | W. of I. | Irish Republican Army E Coy., 7th Battn., No. 2 Brigade | Ballydaly | Con Murphy Memorial |
| Murphy, Cornelius | W. of I. | Irish Republican Army 2nd. Btn., 4th Cork Brigade | Millstreet, The Square | Millstreet I.R.A. Memorial |
| Murphy, Leo | W. of I. | Irish Republican Army | Waterfall | Murphy Memorial |
| Murphy, T. | W. of I. | Irish Republican Army | Moroe | Limerick Brigades Memorial |
| Murphy, Thomas | W. of I. | Irish Republican Army | Deansgrange Cemetery | Republican Roll of Honour |
| Murray, Thomas | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| Nangle, Joe | W. of I. | Irish Republican Army | Sheemore | I.R.A. Memorial |
| Naughton, P. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| Needham, Jack | W. of I. | Irish Republican Army F Coy, 8th Btn, | Dunnamaggin | Dunnamaggin Memorial |
| Neville, Daniel (Domhnall Ó Niadh) | W. of I. | Irish Republican Army | Newcastlewest, St. Ita's Road | Newcastlewest 1916-1922 Memorial |
| Newell, Michael (Micheál Ó Tnuthail) | W. of I. | Not stated | Castlegar | Castlegar Republican Memorial |
| Ó Beirgin, Seán | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| Ó Beirn, Seósamh (Beirne, Joe) | W. of I. | Irish Republican Army | Selton Hill | I.R.A. Memorial |
| Ó Briain, Seán | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| O Briain, Tomás | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| Ó Briain, Tomas | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| O Broin, Seosamh | W. of I. | Irish Republican Army | Dublin 02, Pearse Street, No. 144 | IRA Memorial |
| Ó Cadhla, Míchéal (Michael Kiely) | W. of I. | Irish Republican Army 5th "geal", 4th Cork Brigade. | Mallow Bridge | Mallow I.R.A. Memorial |
| O Ceallacháin, Domhnall | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| Ó Chathasaigh, Pádraig | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| Ó Ciardha, Donncha | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| Ó Cinneide, Micheál | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| Ó Cinneide, Micheál | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| Ó Conchubhair, Padraig | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| Ó Conghaile, Seán (Connolly, Seán) | W. of I. | Irish Republican Army | Selton Hill | I.R.A. Memorial |
| Ó Críodáin, Eamonn (Eamonn Creedon) | W. of I. | Irish Republican Army 5th "geal", 4th Cork Brigade. | Mallow Bridge | Mallow I.R.A. Memorial |
| Ó Dorcháin, Pádraig (Patrick Dorgan) | W. of I. | Irish Republican Army 5th "geal", 4th Cork Brigade. | Mallow Bridge | Mallow I.R.A. Memorial |
| Ó Duibheannaigh, Seamas | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| Ó Duibheannaigh, Tomas | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| Ó Floinn, Pádraig (Patrick O'Flynn) | W. of I. | Irish Republican Army 5th "geal", 4th Cork Brigade. | Mallow Bridge | Mallow I.R.A. Memorial |
| O h-Anluain, Brian | W. of I. | Irish Republican Army | Dublin 02, Pearse Street, No. 144 | IRA Memorial |
| Ó Hailín, Seán | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| O hAilpin, Tomas (Halpin, Thomas) | W. of I. | Irish Republican Army | Drogheda, The Marsh Road | Halpin and Moran Memorial |
| Ó hIci, Micheál | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| Ó Laoire, Seán | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| O Leidhin, Seán | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| Ó Liatháin, Stiobháin (Stephen Lehane) | W. of I. | Irish Republican Army 5th "geal", 4th Cork Brigade. | Mallow Bridge | Mallow I.R.A. Memorial |
| Ó Luanaigh, Micheál (Michael Looney) | W. of I. | Irish Republican Army 5th "geal", 4th Cork Brigade. | Mallow Bridge | Mallow I.R.A. Memorial |
| O Maicin, Peadar | W. of I. | Irish Republican Army | Dublin 02, Pearse Street, No. 144 | IRA Memorial |
| O Maolchatha, Tomás | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| Ó Maolchathaigh, Tomás (Thomas Mulcahy) | W. of I. | Irish Republican Army 5th "geal", 4th Cork Brigade. | Mallow Bridge | Mallow I.R.A. Memorial |
| O Mathghamhna, Padraig | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| O Morain, S. (Moran, S.) | W. of I. | Irish Republican Army | Drogheda, The Marsh Road | Halpin and Moran Memorial |
| O Mordha, Muiris | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| O Murchadha, Conchubhar | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| O Murchadha, Risteard | W. of I. | Irish Republican Army | Dublin 02, Pearse Street, No. 144 | IRA Memorial |
| O Murchadha, Seosamh | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| Ó Nualláin, Séamas | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| Ó Raghallaigh, Seán S. (O'Reilly, John Joe) | W. of I. | Irish Republican Army | Selton Hill | I.R.A. Memorial |
| Ó Raghallaigh, Seán S. (O'Reilly, John) | W. of I. | Irish Republican Army | Selton Hill | I.R.A. Memorial |
| Ó Ríain, Padraig | W. of I. | Not stated | Nenagh, Banba Place | Nenagh Republican Memorial |
| Ó Rinn, Séamus (Rynn, Séamus a.k.a. Wrynne, Séamus) | W. of I. | Irish Republican Army | Selton Hill | I.R.A. Memorial |
| Ó Rónáin, Pádraig | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| Ó Rónáin, Pádraig (Patrick Ronayne) | W. of I. | Irish Republican Army 5th "geal", 4th Cork Brigade. | Mallow Bridge | Mallow I.R.A. Memorial |
| Ó Scolaighe, Liam | W. of I. | Irish Republican Army 3rd Kerry Brigade | Caherciveen, Church Street | Caherciveen Republican Memorial |
| O Suilleabhain, Padraig | W. of I. | Irish Republican Army | Cork, City Gaol | Cork City Gaol Memorial |
| Ó Suilleabháin, Séamas | W. of I. | Irish Republican Army West Cork Brigade Flying Column | Kilmichael | Kilmichael Ambush Memorial |
| O'Brian, Patrick (Pádraig Ó Briann) | W. of I. | Irish Republican Army | Newcastlewest, St. Ita's Road | Newcastlewest 1916-1922 Memorial |
| O'Brien, Dan | W. of I. | Irish Republican Army | Galbally | Galbally Memorial |
| O'Brien, Denis (Ó Briain, D.) | W. of I. | Irish Republican Army | Kilcrumper, Fermoy | Kilcrumper Memorial |
| O'Brien, Edmond | W. of I. | Irish Republican Army | Galbally | Galbally Memorial |
| O'Brien, John | W. of I. | Irish Republican Army | Donoughmore | Creedon, O'Brian and Healy Memorial |
| O'Brien, John J. | W. of I. | Irish Republican Army | Galbally | Galbally Memorial |
| O'Brien, P. | W. of I. | Irish Republican Army | Moroe | Limerick Brigades Memorial |
| O'Brien, Pat | W. of I. | Irish Republican Army 1st Btt., Tipperary No. 1 Brigade | Modreeny | Modreeny Ambush Memorial |
| O'Brien, Seamus | W. of I. | Irish Republican Army | Rathdrum Post Office | O'Brien Memorial |
| O'Brien, Thomas | W. of I. | Irish Republican Army | Ballinattin | Ballinattin Memorial |
| O'Brien, Thomas | W. of I. | Irish Republican Army | Donoughmore Cemetery | Donoughmore Cemetery I.R.A. Memorial |
| O'Brien, Thomas (O Briain, Tomas) | W. of I. | Irish Republican Army | Dripsey | Dripsey Memorial |
| O'Brien, W. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Brien, William | W. of I. | Irish Republican Army | Tipperary, Station Road | Tipperary Barracks Memorial |
| O'Brien, William | W. of I. | Irish Volunteers | Midleton, Main Street | Midleton I.R.A. Memorial |
| O'Brien, William P. | W. of I. | Irish Republican Army | Galbally | Galbally Memorial |
| O'Callaghan, Daniel | W. of I. | Irish Republican Army | Donoughmore Cemetery | Donoughmore Cemetery I.R.A. Memorial |
| O'Callaghan, Daniel (O Ceallachain, Domhnall) | W. of I. | Irish Republican Army | Dripsey | Dripsey Memorial |
| O'Callaghan, James | W. of I. | Irish Republican Army | Killavullin | O'Callaghan Memorial |
| O'Callaghan, James (Ó Ceallacháin, Séamus) | W. of I. | Irish Republican Army | Kilcrumper, Fermoy | Kilcrumper Memorial |
| O'Callaghan, Michael | W. of I. | Irish Republican Army | Moroe | Limerick Brigades Memorial |
| O'Callaghan, Michael | W. of I. | Not stated | Limerick, Strand Hotel | Limerick War of Independence Memorial |
| O'Callaghan, Peter | W. of I. | Irish Republican Army | Donoughmore Cemetery | Donoughmore Cemetery I.R.A. Memorial |
| O'Carroll, Sean | W. of I. | Irish Republican Army | Ardee, Drogheda Road | O'Carroll and Tierney Memorial |
| O'Carroll, Sean | W. of I. | Irish Republican Army | Ardee, Sean O'Carroll Street | O'Carroll Memorial |
| O'Connell, John | W. of I. | Civilian (includes clergy, fire services and medics) | Midleton, Main Street | Midleton I.R.A. Memorial |
| O'Connell, Patrick | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| O'Connell, William | W. of I. | Not stated | Glenview, Glantane | Kilshannig Memorial |
| O'Connor Scarteen, Tom | W. of I. | Irish Republican Army Kerry No. 2 Brigade Flying Column | Kenmare, The Square | Kenmare War of Independence Memorial |
| O'Connor, Johnny | W. of I. | Irish Republican Army Kerry No. 2 Brigade Flying Column | Kenmare, The Square | Kenmare War of Independence Memorial |
| O'Connor, M. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Dea, T. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Dea, Thomas (Ó Deaghaidh, Thomás) | W. of I. | Irish Republican Army | Kilcrumper, Fermoy | Kilcrumper Memorial |
| O'Donnell, Denis | W. of I. | Not stated | Kildorrery | Denis O'Donnell Memorial |
| O'Donnell, Patrick | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| O'Donoghue, James (Séamus Ó Donncadha) | W. of I. | Irish Republican Army 1st Battalion, 3rd Cork Brigade | Bandon, Dunmanway Road | Galvin, Begley and O'Donoghue Memorial |
| O'Donoghue, Joseph | W. of I. | Irish Republican Army | Moroe | Limerick Brigades Memorial |
| O'Donoghue, Joseph | W. of I. | Connaught Rangers 1st. Battalion | Dublin 11, Glasnevin Cemetery | Connaught Rangers Mutiny Memorial |
| O'Donoghue, Joseph | W. of I. | Irish Republican Army | Limerick, Strand Hotel | Limerick War of Independence Memorial |
| O'Donoghue, Tim | W. of I. | Irish Republican Army Kerry No. 2 Brigade Flying Column | Kenmare, The Square | Kenmare War of Independence Memorial |
| O'Donohoe, Frank | W. of I. | Irish Republican Army | Elphin, Co. Roscommon | Elphin I.R.A. Memorial |
| O'Donovan, T. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Driscoll, Patrick (Ó Drisceóil) | W. of I. | Irish Republican Army 5th Cork Brigade | Bantry Tourist Office | Bantry I.R.A. Memorial |
| O'Dwyer, - | W. of I. | Irish Republican Army | Soloheadbeg | Soloheadbeg Memorial |
| O'Dwyer, D. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Dwyer, Diarmuid (Ó Duibhir, Diarmuid) | W. of I. | Irish Republican Army 5th Engineers Battalion, Dublin Brigade | Dublin 01, Frederick Street North | O'Dwyer Memorial |
| O'Dwyer, F. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Dwyer, Frank | W. of I. | Irish Republican Army | Bansha | Bansha Memorial |
| O'Dwyer, N. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Dwyer, Ned | W. of I. | Irish Republican Army | Bansha | Bansha Memorial |
| O'Dwyer, P. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Dwyer, Tomas | W. of I. | Irish Republican Army | The Ragg | O'Dwyer Memorial |
| O'Grady, Patrick | W. of I. | Irish Republican Army G Coy, 2nd Btn South Wexford Brigade | Saltmills | Saltmills Explosion Memorial |
| O'Hanlon, P. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Keeffe, F. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Keeffe, J. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Keeffe, Seamus | W. of I. | Irish Republican Army B.Coy., 5th Battn., 3rd. Tipperary Brigade | Two Mile Bridge | O'Keeffe Memorial |
| O'Leary, Jeremiah (Ó Laoghaire, Diarmuid) | W. of I. | Irish Republican Army 5th Cork Brigade | Bantry Tourist Office | Bantry I.R.A. Memorial |
| O'Leary, Michael | W. of I. | Irish Republican Army Kerry No. 2 Brigade Flying Column | Kenmare, The Square | Kenmare War of Independence Memorial |
| O'Mahoney, J. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Mahoney, Patrick (O Mathghamhna, Padraig) | W. of I. | Irish Republican Army | Dripsey | Dripsey Memorial |
| O'Mahony, Michael John | W. of I. | Irish Republican Army | Passage West | O'Mahony Memorial |
| O'Mahony, Patrick | W. of I. | Irish Republican Army | Donoughmore Cemetery | Donoughmore Cemetery I.R.A. Memorial |
| O'Mally, Thomas | W. of I. | Irish Volunteers 'C' Company, 1st Battalion, West Mayo Division | Cloonkeen, Islandeady | O'Mally and Lally Memorial |
| O'Mara, J | W. of I. | Irish Republican Army | Moroe | Limerick Brigades Memorial |
| O'Meara, F. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Meara, Jack | W. of I. | Irish Republican Army F Coy, 8th Btn, | Dunnamaggin | Dunnamaggin Memorial |
| O'Meara, John | W. of I. | Irish Republican Army | Emly | Emly Memorial |
| O'Meara, Phil | W. of I. | Irish Republican Army F Coy, 8th Btn, | Dunnamaggin | Dunnamaggin Memorial |
| O'Meara, Willie | W. of I. | Irish Republican Army F Coy, 8th Btn, | Dunnamaggin | Dunnamaggin Memorial |
| O'Mullane, Daniel | W. of I. | Civilian (includes clergy, fire services and medics) | Mallow Railway Station | Railway Workers' Memorial |
| O'Neill, Andrew | W. of I. | Irish Republican Army B Coy, 8th Btn, | Dunnamaggin | Dunnamaggin Memorial |
| O'Neill, Kieran | W. of I. | Irish Republican Army B Coy, 8th Btn, | Dunnamaggin | Dunnamaggin Memorial |
| O'Neill, L. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Neill, M. | W. of I. | Irish Republican Army | Tipperary, St. Michael's Cemetery | I.R.A. 3rd. Tipperary Brigade Memorial |
| O'Reilly, Daniel (Ó Raghallaigh, Donncha) | W. of I. | Irish Republican Army Third West Cork Brigade | Bandon, Dunmanway Road | Daniel O'Reilly Memorial |
| O'Reilly, Patrick | W. of I. | Irish Republican Army | Dublin 01, Custom House | Customs House Memorial |
| O'Reilly, Patrick | W. of I. | Irish Republican Army West Waterford Brigade | Piltown | Piltown I.R.A. Memorial |
| O'Reilly, Patrick T. (Ó Raghallaigh, Pádraig) | W. of I. | Irish Republican Army 2nd. Batt. | Dublin 01, Custom House | Custom House Fire Memorial |
| O'Reilly, Stephen | W. of I. | Irish Republican Army | Dublin 01, Custom House | Customs House Memorial |
| O'Reilly, Stephen J. (Ó Raghallaigh, Stiofán) | W. of I. | Irish Republican Army 2nd. Batt. | Dublin 01, Custom House | Custom House Fire Memorial |
| O'Riordan, J. | W. of I. | Irish Republican Army | Sraharla | Sraharla Memorial |