Mississauga Brands
- M&M Food Market (6)
- Magicuts (2)
- MANCHU WOK (2)
- Mandarin (2)
- Manitoulin Transport (1)
- Marbleslab Creamery (1)
- Mark's L'Équipeur (4)
- Marlin Travel (10)
- MARRIOTT (11)
- Marshalls (2)
- Mary Brown's (2)
- McDonald's (27)
- Melanie Lyne (2)
- Metro (3)
- MICHAELS (3)
- Midas (7)
- Miniso (3)
- Minuteman Press International (6)
- Mister Transmission (3)
- Mitel (1)
- MNP LTD (5)
- Mobile Snap (1)
- MONEY MART (15)
- MONTANA'S (5)
- Moores Clothing (3)
- Motion Industries (3)
- Moxie's Grill & Bar (1)
- Mr. Greek (2)
- Mr. Lube (8)
- MR.SUB (19)
- Mucho Burrito (2)