Ottawa Brands
- M&M Food Market (7)
- Magicuts (1)
- MANCHU WOK (4)
- Mandarin (1)
- Mappins Jewellers (1)
- Marbleslab Creamery (1)
- Maritime Travel (1)
- Mark's L'Équipeur (4)
- Marlin Travel (2)
- MARRIOTT (6)
- Marshalls (4)
- Mary Brown's (1)
- McDonald's (22)
- MEDIGAS (4)
- Melanie Lyne (2)
- Metro (13)
- MICHAELS (3)
- MICROPLAY (2)
- Midas (4)
- Mind Games (3)
- Miniso (2)
- Minuteman Press International (1)
- Mister Transmission (2)
- MNP LTD (6)
- Mobile Snap (1)
- MONEY MART (8)
- Monsieur Muffler (4)
- MONTANA'S (1)
- Moores Clothing (5)
- Motion Industries (1)
- Moxie's Grill & Bar (1)
- Mr. Lube (3)
- MR.SUB (4)
- MS Society of Canada (1)
- Mucho Burrito (8)