- Oates Land
- 2-12 2-13 2-15 2-16 4-16 6-12 9-2 9-6 16-6 16-8 17-1
- O'Callaghan, A.
- 8-28
- O'Connor, P.D.
- 7-26 7-28 7-46 7-98
- Oka, S.
- 1-31
- Oke, L.R.
- 1-40
- Oliphant, M.L.
- 8-50
- Oliver, R.
- 7-28
- Olympic Games (Melbourne, 1956)
- 10-15
- Ooi, K.H.
- 1-10 1-27
- Optical instruments
- 8-46 8-47 8-48 8-62
- Optical Munitions Panel
- 8-47 8-62
- Order of Australia (AO)
- 1-2 1-40 1-49 1-54 1-61 1-67
- Order of British Empire
- 1-2
- Osborne, J.
- 1-20
- Owens, G.
- 1-28 4-44
- Ozone
- 7-1
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