| 284 | O'BRIEN Anthony Trevor Knapp | 503 | O'BRIEN Terence Patrick |
| 491 | O'CONNOR Francis Patrick Moore | 1091 | O'DONOGHUE Algernon Charles |
| 6632 | O'DONOGHUE Anthony Morison | 1466 | O'DONOGHUE Donald Butler |
| 1136 | O'DONOVAN Bryan | 3361 | O'FLAHERTY James Patrick |
| 3848 | O'GRADY Richard James Dennington | 2572 | O'HANLON Michael Charles |
| 414 | O'HARA Donald Frederick | 3918] | O'HARA Edward Hamilton James McCallum |
| 5686] | O'HARA Edward Hamilton James McCallum | 7245 | O'HARA Michael Joseph |
| 3066 | O'LEARY Ernest Arthur | 4898 | O'MEARA Alfred Terence |
| 6049 | O'MEARA Robert Barry | 4410 | O'MEARA Walter George |
| 960 | O'MOLONY Francis Chidley | 1912 | O'REILLY Bernard Laurence Joseph |
| 3282 | O'REILLY V.J. | 1257 | O'RIORDAN Patrick Kevin |
| 1855 | O'RIORDAN Thomas Patrick | 4121 | O'ROURKE Terence Adrian |
| 326 | O'SHEA Brendan | 3543] | O'SHEA Brian Stephen |
| 3578] | O'SHEA Brian Stephen | 92 | O'SHEA Colin Patrick |
| 453 | O'SHEA Dermod | 93 | O'SHEA Desmond Patrick |
| 6247 | O'SHEA Malachy Raphael | 3308] | O'SHEA Patrick Thomas |
| 3706] | O'SHEA Patrick Thomas | 7377 | O'SHEA Piers Brendon Thomas |
| 3575 | O'SHEA Terence Richard | 3175] | O'SHEA William Francis |
| 4713] | O'SHEA William Francis | 5838 | O'SULLIVAN Thomas Patrick (Chaplain) |
| 3540] | O'TOOLE Brian Clery | 3769] | O'TOOLE Brian Clery |
| 1119 | O'TOOLE Rory Michael | 7407 | OAKRHIND Granville Clive Scobie |
| 2535 | OATES Gerald Charles | 2907 | OBERHOLSTER D.P. |
| 3284 | OBERHOLSTER Johannes Henry | 6178 | OBORSKI Michael |
| 7519 | OCHUDI Gadd | 760 | ODENDAAL Christian Jacobus |
| 4182 | ODENDAAL Francis van Wyk | 7323 | ODENDAAL Henry Douglas |
| 1994 | ODENDAAL Kolneraad Cornelus | 864 | ODENDAAL Michael Johannes |
| 4076 | ODENDAAL Piet Soames Benjamin | 2607 | ODENDAAL Samuel Kenneth |
| 7531 | OGALA Evans Gamaliel | 4314 | OLIVER Clarence Allen Grant |
| 6000 | OLIVER Henry George | 1050 | OLIVIER David Abraham Dupreez |
| 882 | OLIVIER Fredrick Petrus Stephanus | 3004 | OLIVIER Jeremias Cornelius Johannes |
| 4873 | OLIVIER Johannes Cornelius Jeremais | 2068 | OLIVIER Johannes Ladovikus |
| 2532 | OLLENDORFF R. | 6488 | OMAN Colin Samuel |
| 7386 | OMINDE Richard Pye | 7546 | OMONDI George Washington |
| 3912 | OMMANNEY David Graeme | 7568 | ONDICHO Saul |
| 6437 | ONSLOW Desmond Merrick | 3885] | ONSLOW Richard Douglas Lofturs |
| 5723] | ONSLOW Richard Douglas Lofturs | 2121 | OOSTHUIZEN Jonathan Theodore |
| 3188 | OPPLER Rudolf | 2679 | ORBAN DE XIVRY Edward Marie Louis Albert Georges |
| 2680 | ORBAN DE XIVRY Jaques Jean Pierre | 4893 | ORME-SMITH Christopher David Andrew |
| 3326 | ORPEN Bernard le Edward | 6876 | ORTON John Lawrence |
| 3813 | OSBORN Bertram Henry | 4110 | OSBORN Ian Michael |
| 431 | OSBORNE David | 2113 | OSBORNE Robert Glasson |
| 4649 | OSBORNE Wesley James | 7425 | OSMOND Keith Howard |
| 3144 | OTTO Matthys Johannes | 3756] | OULTON Kenneth Vivian |
| 4771] | OULTON Kenneth Vivian | 5828] | OULTON Kenneth Vivian |
| 6232] | OULTON Kenneth Vivian | 7527 | OUMA George Gerishom |
| 6709 | OUTRAM Robin | 888 | OUTRAM Sydney William |
| 3325 | OUZAM Leslie | 4618] | OVERDYCK Claus Peter |
| 5855] | OVERDYCK Claus Peter | 6001 | OVERDYCK Max Frederick |
| 1694 | OWEN Harold Alfred | 4871] | OWEN John Wilson |
| 5820] | OWEN John Wilson | 1176 | OWEN Leonard |
| 1129 | OWEN Leslie Richard | 7317 | OWEN Michael Wyndham Shaw |
| 6858 | OWEN Peter John Aird | 40152 | OWEN-SMITH Woodford George Owen |
| 4386 | OWEN-THOMAS David | 4451 | OWEN-THOMAS Peter Danford |
| 3754 | OWLES Hugh Trafford | 4281] | OWLES Roger Francis Ferrier |
| 5880] | OWLES Roger Francis Ferrier | 6152] | OWLES Roger Francis Ferrier |
| 7107 | OXFORD Charles Robert | | |