- O'brien Pat Mechanical Service Ltd
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- O'canada
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- O'connor Grocery
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- O'connor Radiology
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- O'connor Smoke Shop
- O E M Ltd-Pro Am Tool Centre
- O'gorman & Associates
- O'kane & Associates Insurance Ltd
- O'malley Communications
- Oaaph
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- Oakes Daniel E & Associates Ltd
- Oasis
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- Oasis Tanning Studio
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- Openlava Software Inc
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- Osler Hoskin & Harcourt Llp, Abugov Lorne H
- Osler Hoskin & Harcourt Llp, Aitken David W
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- Osler Hoskin & Harcourt Llp, Brady Patricia
- Osler Hoskin & Harcourt Llp, Cheng Ronald C
- Osler Hoskin & Harcourt Llp, Cornish Diane E
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- Osler Hoskin & Harcourt Llp, White Donna G
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- Osler Hoskin & Harcourt Llp, Wilson Patricia J
- Osler Hoskin & Harcourt Llp, Wright Craig
- Ostco Carpet Improvements Inc
- Osteoporosis Information and Self-Help Group Ostop O
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- O & Y Enterprise Lp, National Capital Region Office
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