Oneness - World Communications

OneProsper International Inc.

Ontario Bird Banding Association

Ontario Branch Of The International Order Of The King's...

Ontario Cerebral Palsy Sports Association

Ontario Circuit 10-a Jehovah's Witnesses

Ontario Circuit 10b Of Jehovah's Witnesses

Ontario Circuit 20b Of Jehovah's Witnesses

Ontario Demolay Foundation

Ontario Dyslexia Association/association Ontarienne De La...

Ontario Traumatic Injury Association

Ontario Youth Parliament Association Inc.

Open Score

Opera Lyra

Operation Break Of Ottawa-carleton Inc

Operation Come Home / Opération rentrer au foyer

Operation Go Home

Optimist Club Of Nepean Charitable Fund

Options Bytown Non-profit Housing Corporation

Or Haneshamah - Ottawa's Reconstructionist Community