- Oakander, M.A.; MD; Clinical Assistant Professor (Psychiatry)
- Oakleaf, D.A.; BA (UofT), MA (UofT), PhD (UofT); Associate Professor (Department of English)
- Oakley, B.C.; BES (UofM), MArch (UofM); Adjunct Assistant Professor (Environmental Design)
- O'Beirne, M.; CCFP, MD (UofC), PhD (UofC), BSc (UofT), MSc (UofT); Associate Professor - Medicine (Family Medicine)
- Oberle, K.M.; BSc(Nur) (UofA), MN (UofA), PhD (UofA), Reg. Nurse (UofA); Adjunct Professor (Faculty of Medicine), Professor (Faculty of Nursing)
- O'Brien, M.G.; BA (OSU), MA (Texas), PhD (UW-Madison); Assistant Professor (Germanic Slavic East Asian St)
- Oddie, S.D.; MSc (UofC), PhD (UofC), BSc (UofL); Adjunct Associate Professor (Psychology)
- Oddone Paolucci, E.; BA (Hons) (UofC), MSc (UofC), PhD (UofC); Adjunct Assistant Professor (Community Health Sciences), Adjunct Assistant Professor (Surgery)
- Odiemo, L.; PhD (Leeds), BEd (Nairobi), MPhil (NorwTA); Adjunct Instructor (Faculty of Education)
- Oetelaar, G.A.; Cert (Ottawa), MA (SFU), PhD (SIU), BA (UofC); Professor (Archaeology)
- Ogilvie, T.R.; FRCPC (RCPSC), MD (UofS); Assistant Professor - Medicine (Pathology & Laboratory Med)
- O'Grady, J.K.; AA (OCAD), MBA (OSU), MA (RCA), PhD (UofC), BA (UofG); Associate Professor (Environmental Design)
- O'Keefe, K.P.G.; PEng (APEGGA), BSc(Hons) (UBC), BSc (UofC), PhD (UofC); Assistant Professor (Geomatics Engineering)
- Okoniewski, M.; PEng (APEGGA), MSc (Gdansk), PhD (Gdansk); Professor (Electrical & Computer Eng), Tier ll CRC-Appl Electromagnet (Electrical & Computer Eng), Alvin Libin Chr-Biomed Engg (Electrical & Computer Eng)
- Olbey, C.W.; BA (UofC), MA (UofC); Instructor (Department of English)
- Olfert, L.A.; Clinical Lecturer (Family Medicine)
- Olson, B.J.; FRCPC, MD; Clinical Assistant Professor (Anaesthesia)
- Olson, J.D.D.; Diploma (NAIT), MLA (UofM); Adjunct Associate Professor (Environmental Design)
- Oluboka, O.J.; FRCPC, BSc (UIL), MSc (UIL); Clinical Assistant Professor (Psychiatry)
- Oluga, M.; MEd (AKU-IED), BEd (Kenyatta); Adjunct Instructor (Faculty of Education)
- Oluwadairo, S.A.; MSc, MB BS (Ibadan); Clinical Assistant Professor (Psychiatry)
- O'Neill, B.L.; BA (Hons) (Brock), MA (McMaster), PhD (UBC); Associate Professor (Political Science)
- Onguko, B.B.; BEd (Kenyatta), MEd (Kenyatta), MSc (Twente); Adjunct Instructor (Faculty of Education)
- Organowski, S.; FRCPC, MD; Clinical Assistant Professor (Anaesthesia)
- Orsel, K.; DVM (Utrecht), MSc (Utrecht), PhD (Utrecht); Assistant Professor (Production Animal Health)
- Ortiz-Neira, C.L.; MD; Clinical Assistant Professor (Radiology)
- Orwe, M.; MEd (AKU), BEd (Kenyatta); Adjunct Instructor (Faculty of Education)
- Oryschak, A.F.; MD, MSc; Clinical Assistant Professor (Pathology & Laboratory Med)
- Osborn, G.D.; BA (UC), PhD (UC); Professor (Department of Geoscience)
- Osler, M.J.; MA (Indiana), PhD (Indiana), BA (Swarthmore); Adjunct Professor (Department of Philosophy), Professor (History)
- Osman-Ahmed, A.H.; BSc (Cairo), MSc (Cairo), PhD (UofC); Adjunct Assistant Professor (Electrical & Computer Eng)
- Osthoff, H.D.; MSc (UofA), PhD (UofA), BSc(Hons) (Victoria); Assistant Professor (Chemistry)
- Ottmann, J.; BEd (UofC), MEd (UofS); Assistant Professor (Faculty of Education)
- Ousman, S.S.; PhD (McGill), BSc(Hons) (Queen's), MSc (Queen's); Assistant Professor - Medicine (Clinical Neurosciences)
- Ouyed, R.; MSc (McMaster), PhD (McMaster); Associate Professor (Physics & Astronomy)
- Ovenden, M.E.; BMSc, FRCPC, MD; Clinical Assistant Professor (Paediatrics)
- Owen, J.; PhD (Carleton), BSc (UBC); Instructor (Department of Geoscience)
- Oxoby, R.J.; BSc (SCU), MA (SJSU), PhD (UC); Associate Professor (Economics)
- Oyoo, S.; MEd (Leeds), PhD (MON), BEd (UON); Adjunct Assistant Professor (Faculty of Education)
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