Frank Wentworth O'Neill (aka Frank Wentworth Farrell)
Vincent James O'Connor
Harold Edward Ormond O'Brien
Marcus Maingay Osborne
Tom O'Reilly
Albert Henry O'Shea
Joseph Alexander Oldfield
C. O'Brien
James Whately Oliver
Alison Hope Oliver †
Alan Oatley
William Joseph Oldfield †
William Charles Joseph O'Brien
Charles Joseph Ohler
George Orr
Adrian Paul Beresford O'Brien
Jack Davidson Oliver
Michael O'Neill
Gerald Joseph O'Neill
Geoffrey Oatley
William Dalgleish Oliver
Henry Edwin O'Connor
Alexander Montague Oakes †
Sidney Oldroyd
Percy Dowell Oliver