Oswald Drinkwater & Graham Ltd.
Otal (north America) Inc.
Other Peoples Music Inc.
Oti Technologies Inc.
Otish Energy Inc.
OTM Knowledge Services Inc.
Otnorot Holdings Inc.
Otomofil International Inc.
Ots Refining Equipment Corporation
Ottawa Fibre GP inc.
Ottawa Fibre Gp Inc.
Ottawa Forum Limited
Ottawa International Fuel Facilities Corporation
Ottawa Valley Motion Pictures Inc.
Ottermoon Music Publishing Inc.
Otto Boot Design Limited
OttoBaer Inc.
Ouareau Film Productions Inc.
Oubliette Holdings Inc.
Our Heroes Corp.