- O'Brien, Bernard McCarthy ('Champ') (1924 - 1993), Surgeon, Educator and Research Director
- Obstetrics and Gynaecology Department
- see Department of Obstetrics and Gynaecology, The University of Melbourne
- Obstetrics Chair
- see Chair in Obstetrics (1929 - 1951), The University of Melbourne
- Obstetrics Professorship
- see Chair in Obstetrics (1929 - 1951), The University of Melbourne
- Office of the Dean of a Clinical School, The University of Melbourne
- Office of the Dean of Medicine (1876 - ), Faculty of Medicine
- Office of the Dean of Medicine and Dentistry (1989 - 1991), Faculty of Medicine and Dentistry
- Office of the Dean of Medicine, Dentistry and Health Sciences (1991 - ), Faculty of Medicine, Dentistry and Health Sciences
- Office of the Sub-Dean of a Clinical School, The University of Melbourne
- Ophthalmology Chair
- see Chair in Ophthalmology (1963 - ), The University of Melbourne
- Ophthalmology Department
- see Department of Ophthalmology (1963 - ), The University of Melbourne
- Ophthalmology Professorship
- see Chair in Ophthalmology (1963 - ), The University of Melbourne
- Osborne, William Alexander (1873 - 1967), Physiologist, Educator and Dean
- Otolaryngology Department
- see Department of Otolaryngology (1970 - ), The University of Melbourne
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