- OTAN (Organisation du traité de l'Atlantique Nord)
- Otaries et phoques
- Ottawa
- Musique à Ottawa
- Ottawa, accords d'
- Ottawa and Alberta Head for Emissions Control Showdown
- Ottawa Apologizes to Natives
- Ottawa Appeals Pay Equity Ruling
- Ottawa Ballet
- Ottawa Citizen, The
- Ottawa Endorses Québec Partition
- Ottawa Fudging Hospital Wait-time guidelines
- Ottawa Journal
- Ottawa Massacre
- Ottawa Purchases New Helicopters
