| Maya Heat Transfer Technologies Ltd | Quebec |
| MayaTech, Inc. | |
| Mayday Labs, Inc. | |
| Mayet Information Systems | Manitoba |
| Mayo615 Technology Partners Ltd | |
| Mazawo | Ontario |
| Mazlite, Inc. | |
| MB Computer Depot | Ontario |
| MB Creative | Ontario |
| MB Foster | Ontario |
| MB Group | |
| MBC Computer Services Ltd | Ontario |
| MBI I.T. Services | |
| MBI Solutions Informatiques, Inc. | |
| MBI Systems Software, Inc. | |
| mbiance | Quebec |
| MBNA Canada | |
| mbWeb | Quebec |
| MC Countermeasures, Inc. | Ontario |
| MC Group, Inc. | Ontario |
| Mc Infosys | Ontario |
| Mc-Inov, Inc. | Quebec |
| McAnerin International, Inc. | Alberta |
| MCB Solutions | |
| MCBWeb.com | British Columbia |
| MCDI Security Products, Inc. | Quebec |
| McGill Centre for Integrative Neuroscience | |
| McGill IALab | Quebec |
| McGill University | Quebec |
| McGill University - Center for Intelligent Machines | Quebec |
| McGill University - Computational Geometry Lab | Quebec |
| McGill University - Department of Mathematics and Statistics | Quebec |
| McGill University - Dobson Centre for Entrepreneurship | Quebec |
| McGill University - Electrical and Computer Engineering | Quebec |
| McGill University - McGill Institute for Aerospace Engineering | Quebec |
| McGill University - McGill Quantum Optics & Sensing Lab | |
| McGill University - Microelectronics And Computer Systems Laboratory | Quebec |
| McGill University - Quantum Nano Electronics Laboratory | Quebec |
| McGill University - Sable Research Group | Quebec |
| McGill University - School of Computer Science | Quebec |
| McGill University - The Computational Geometry Lab | Quebec |
| McGill University Centre for Intelligent Machines | Quebec |
| McGill University Health Centre | |
| McGuire Financial Group | |
| MCH Multimedia, Inc. | Quebec |
| McHacks | Quebec |
| McIlwrath Computer Services, Inc. | Ontario |
| McInnes Cooper | |
| MCJ Conseil | Quebec |
| McKenzie College | New Brunswick |