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- Oates, George Charles
- O'Brien, Edward Pennefather
- O'Brien, Rev. John
- O'Brien, Hon. Lucius Murrough
- O'Brien, Richard Barry
- O'Byrne, Robert
- O'Clery, Patrick Keyes
- O'Connor, Arthur (John Aloysius)
- Odgers, William Blake
- O'Dowd, James Cornelius
- O'Dwyer, Joseph Gillespie
- O'Feely, Timothy O'Brien
- Ogier, John Creuzé Hingeston
- Ogilvie, Glencairn Stuart
- Ogilvy, Henry Thomas
- Ogle, Bertram Savile
- Ogle, John
- Moung Bah Ohn
- Okamura, Teruhiko
- O'Kelly, Arundell de Pentheny
- O'Kinealy, James
- O'Kinealy, Peter
- Oldfield, Edmund
- Oldfield, Thomas
- O'Leary, Denis (Charles) MacCarthy
- Kington-Oliphant, Thomas Laurence
- Oliver, Alexander
- Oliver, Lionel
- Oliver, Thomas
- Oliverson, Richard
- Ollier, Renny
- Olliffe, Thomas Francis
- Ollivant, Joseph Earle
- O'Malley, Edward Loughlin
- O'Malley, Emilius St. Clair
- O'Mara, Thomas Chrysostom
- Omond, Thomas Stewart
- O'Neill, Allan William
- O'Neill, Lewis
- Onslow, Alexander Campbell
- Onslow, Francis Phipps
- Onslow, Richard
- Ord, Richard
- O'Regan, John Thomas
- Orme, Charles Cave John
- Ormerod, Rev. George Thomas Bailey
- Ormerod, Herbert Eliot
- Ormsby, Henry Leigh
- Ormsby, William Edwin
- Orpen, Goddard Henry
- Orr, William Watt
- Orred, Charles Fletcher d'Anyers
- Orrell, Joseph
- Osborne, Frederic
- O'Shaughnessy, Richard
- Osler, Timothy Smith
- O'Sullivan, Patrick
- Oswald, James Francis
- Oswell, William Edward
- Otter, Francis
- Otter, John Lonsdale
- Otway, Sir Arthur John, Bart.
- Outhwaite, William Eugene
- Overend, Charles William Pinkstan
- Humphreys-Owen, Arthur Charles
- Owen, Edward Annesley
- Cunliffe-Owen, Edward
- Owen, Hugh
- Owen, Sidney James
- Owen, William
- Owen, William Stevenson
- Owsley, John William
- Oxenham, Edward Lavington
- Oxley, John Stewart
