- Merle Norman Cosmetics & Gifts
- Merle Norman Cosmetics Studio
- Merle Norman Cosmetics Studios
- Merle Norman Studio
- Merlin Muffler & Brake
- Merlin's Muffler & Brake
- Merlo's Cutlery
- Merrell
- Merriam-Graves Medical Products
- Merrill Corporation
- Merrill Lynch
- Merrill Lynch Pierce Fenner & Smith
- Merry Maids
- Merry-Go-Round
- Mervyn's
- Mervyn's Department Stores
- Mesco
- Message Center
- Messer GT & S
- Messmer's
- Met Food
- Metabolife
- Metal Express
- Metal Improvement
- Metal Mart
- Metal Masters
- Metal Products
- Metal Shop
- Metal Supermarkets
- Metal Tech
- Metalcraft
- Metal-Fab
- Metals USA
- Metalwest
- Metamorphosis
- Metcalf & Eddy
- Methodist Hospital
- MetLife Auto & Home
- MetLife Auto & Home Insurance