# Thom's Irish Who's Who/O

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compiled list
* O'Brien, Baroness Annie
* O'Brien, Christopher Michael
* O'Brien, His Honour Judge Daniel Joseph
* O'Brien, Dermod
* O'Brien, Hon. Donough Edward Foster
* O'Brien, Hon. Donough
* O'Brien, Edmond Lyons
* O'Brien, Hon. Edward Donough
* O'Brien, Colonel Eoghan
* O'Brien, George
* O'Brien, Capt. Hon. Henry Barnaby
* O'Brien, John Robert
* O'Brien, Kendal Edmund
* O'Brien, Hon. Lucius Murrough
* O'Brien, Lt.-Col. Hon. Murrough
* O'Brien, Hon. Phadrig Luciue Ambrose
* O'Brien, Sir Timothy Carew
* O'Brien, Torlogh
* O'Brien, Alderman William
* O'Brien, William
* O'Brien, Hon. William Henry Robert Ernest Turlough
* O'Byrne, Count John Edward Gerald O'Byrne
* O'Callaghan, Daniel
* O'Callaghan, Mrs. Kate
* O'Callaghan-Westropp, Col. George
* O'Carroll, Joseph Francis
* O'Ceallaigh, Sean T.
* O'Connell, Daniel Charles
* O'Connell, Rev. Frederic Wm.
* O'Connell, Major James Ross
* O'Connell, John Joseph
* O'Connell, Sir John Robert
* O'Connell, Capt. Sir Maurice James Arthur
* O'Connell, Sir Peter Reilly
* O'Connell, Lady Mary Pauline
* O'Connell, Thomas Joseph
* O'Connor, Arthur John
* O'Connor, Right Hon. Charles Andrew
* O'Connor, George Richard
* O'Connor, Right Hon. James
* O'Connor, Lieut.-Col. Patrick Fenelon
* O'Connor, Thomas Power
* O'Conor, Charles Hugh
* O'Conor, Edmond
* O'Conor, Lady Minna Margaret
* O'Conor Don, The, Owen Phelim O'Conor
* O'Doherty, Eileen
* O'Doherty, James Edward
* O'Doherty, Joseph
* O'Doherty, Philip
* O'Doherty, Most Rev. Thomas
* O'Donnell, Charles James
* O'Donnell, Elliot
* O'Donnell, John
* O'Donnell, Rev. Michael J.
* O'Donnell, Thomas (M.P. West Kerry)
* O'Donnell, Thomas (T.D. Sligo–Mayo East)
* O'Donnell, Lieut.-Gen. Sir Thomas Joseph
* O'Donoghoe, Sir James
* O'Donoghue, Geoffrey (The O'Donoghue of the Glens)
* O'Donoghue, Tadhg
* O'Donoghue, Thomas
* O'Donovan, Fred
* O'Donovan, The, Morgan William O'Donovan
* O'Dowd, John
* O'Duffy, General Owen
* O'Dwyer, Sir Michael Francis
* O'Dwyer, Robert
* O'Farrell, Charles Richard
* O'Farrell, Sir Edward
* O'Farrell, Surgeon-General Thomas
* O'Farrell, Thomas T.
* O'Farrelly, Miss Agnes
* O'Ferrall, John Forbes
* O'Ferrall, Dominic More-
* O'Flaherty, Samuel
* O'Flanagan, Reverend Michael
* Ogilby, Lt.-Col. Robert James Leslie
* O'Gorman, Col. Nicholas Purcell O'Gorman (The O'Gorman)
* O'Grady, Guillamore
* O'Grady, Major Hugh Hamon Massy
* O'Grady, William De Rienzi O'Grady (The O'Grady)
* O'Hara, Arthur Cooper
* O'Hara, Charles Kean
* O'Hara, Lt.-Col. Erril Robert
* O'Hara, Right Rev. Henry Stewart
* O'Hara, Colonel James
* O'Hara, Major Patrick Henry Augustus
* O'Higgins, Brian
* O'Keeffe, Major-Gen. Sir Manus William
* O'Keeffe, Patrick
* O'Keeffe, Stephen Charles Martin Lanigan-
* O'Kelly, De Gallagh et Tycooly, Count Gerald Edward
* O'Kelly, Capt. Henry Kane
* O'Kelly, John Thomas
* O'Kelly, Sean Joseph (Sceilig)
* O'Kelly, Rev. Thomas
* O'Kennedy, Very Rev. Canon Richard
* O'Leary, Daniel Henry
* O'Loghlen, Sir Michael
* O'Loingsigh, Fionan
* O'Mahony, Sean
* O'Mahony, Pierce Charles de Lacy O'Mahony (The O'Mahony)
* O'Maille, Prof. Tomas
* O'Maille, Padraic
* O'Malley, Ellen
* O'Malley-Keyes, Major Middleton
* O'Mara, James
* O'Mara, Joseph
* O'Mara, Alderman Stephen Mary
* O'Meagher, Col. John Kevin
* O h-Aodha, Padraig
* O'Neill, Baron
* O'Neill, Major Edward Michael
* O'Neill, Rev. George
* O'Neill, Rev. John
* O'Neill, Rev. Patrick
* O'Neill, Right Hon. Laurence
* O'Neill, Maire
* O'Neill, Patrick
* O'Neill, Rt. Hon. R. W. Hugh
* O'Neill, Colonel William Henry Slingsby
* O'Neill-Power, Captain John Joseph
* O'Nolan, Rev. Gerald
* O'Rahilly, Alfred
* O'Rahilly, Thomas F.
* Oranmore and Browne, Baron
* O'Reilly, Captain Ferdinand Hugh Luke de la Pere
* O'Reilly, Lt.-Col. Charles Myles
* O'Reilly, William Joseph
* Orme, Christopher Guy
* Ormonde, Marquess of
* Ormsby, Anthony
* Ormsby, Colonel Gilbert John Anthony
* Ormsby, Lieut.-Col. Thomas
* Ormsby, Sir Lambert Hepenstal
* Ormsby-Gore, Hon. William George Arthur
* O'Rorke, Charles Trench
* Orpen, Goddard Henry
* Orpen, R. Caulfeild
* Orpen, Major Sir William
* Orr, Very Rev. John
* Orr, Major Michael Harrison
* Orr, Thomas
* Orr, William M'Fadden
* Osborne, Rev. James Denham
* Osborne, His Honor Judge Robert Ernest
* O'Shannon, Cathal
* O'Shaughnessy, M. M.
* O'Shaughnessy, Patrick Joseph
* O'Shaughnessy, Richard
* O'Shaughnessy, The Right Hon. Thomas Lopdell
* O'Shaunessy, George Francis
* O'Shea, Sir Henry
* O'Shee, Col. George Iver Patrick Poer-
* O'Shee, James John
* O'Shee, Lieut.-Col. Richard Alfred Poer-
* Ossory, Bishop of
* Ossory, Ferns And Leighlin, Bishop of
* Ossory, Earl of
* O'Sullivan, Eugene
* O'Sullivan, Gerald
* O'Sullivan, Professor John M.
* O'Sullivan, Timothy
* O'Sullivan-Beare, Daniel Robert
* Oulton, George Nugent
* Ovenden, Charles Thomas
* Ovens, Brig.-Gen. Robert Montgomery
* Owen-Lewis, Lieut.-Col. Arthur Francis
* Oxmantown, Lord