- Oborn, L.E. (New Zealand Geological Survey)
- 15-32
- Obruchev, D.
- 7-4 17-29
- O'Connor, P.D. (Australian Academy of Science)
- 7-22 7-35
- O'Driscoll, Desmond
- 1-21
- O'Driscoll, E.S. Tim (Western Mining Corporation)
- 6-18 7-28 7-29 7-30 7-31 7-32 7-33
- Oil
- 8-9 8-50 8-55 9-8 9-11 9-12 9-15 15-49 16-8 16-21 16-25 18-8 18-9 19-3 19-4
- Oil, Shafts, photographs
- 18-9
- Oldfield, R.J. (Macquarie University)
- 1-37 15-27 15-40 15-47
- Oliphant, M.L.E. (Australian National University), Oliver & Boyd Ltd
- 1-44 7-22 7-24 10-1 10-2 10-8 10-12 17-28 20-18
- Ollier, Cliff D. (Canberra College of Advanced Education; University of New England; Bureau of Mineral Resources, Geology and Geophysics)
- 1-50 6-19 7-38 8-54 13-4 13-5 15-23 15-51 16-6
- Oodnadatta (SA), photographs
- 18-35
- Orcel, J. (Museum National D'Histoire Naturelle)
- 6-9
- Ord River (WA), photographs
- 18-31
- Orowan, E.
- 8-40
- Orr, D. (Tanganyka Geological Survey)
- 6-1 8-54
- Orsay (France), photographs
- 20-32
- Orvig, Tor (Swedish Museum of Natural History)
- 7-4
- Osborn, Henry Fairfield
- 1-63
- Otway Basin (Victoria)
- 8-2
- Otway Ranges (Victoria)
- 8-36 8-37 8-38 18-19 19-1
- Otways Forest Map, The
- 8-38
- Outlines of Structural Geology
- 1-45 6-13 6-15 15-1 15-2 15-3 15-4 15-5 15-6 15-7 15-8 15-9 15-10 15-11 15-12 15-13 15-14 15-16 15-17 15-18 15-19 15-20 15-21 15-22 15-23 15-24 15-25 15-26 15-27 15-28 15-29 15-31 15-32 15-33 15-34 15-35 15-36 15-37 15-38 15-39 15-42 15-43 15-44 15-46 15-51 15-52 15-53 15-55 19-19 19-20
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