- Opéra national du Québec
- Opera Ontario
- Opera performance
- Opera West
- Operation Dismantle
- Operation Dismantle Case
- Opération McGill français
- Operation Morning Light
- Hupacasath (Opetchesaht)
- Ophthalmology
- Opossum
- OPP Charge Former Bernardo Lawyers
- 'Opportunity Knocks'
- Opposition Party in Canada
- Opting-Out
