| Microsoft Canada | Ontario |
| Microsoft Research Lab - Montréal | Quebec |
| Microsophic, Inc. | Ontario |
| MicroSurvey Software, Inc. | British Columbia |
| Microsys IT & Digital Services | |
| Microsysinc | |
| Microtec Informatique | Quebec |
| Microtech Audio & Video Systems | British Columbia |
| Microtech Cyber Service | British Columbia |
| Microtronix | Ontario |
| Microtronix Systems Ltd | Ontario |
| microXpert | Ontario |
| Microzip Data Solutions, Inc. | British Columbia |
| Micwill Group of Companies Ltd | Saskatchewan |
| Mid Island Computer Enterprises Ltd | British Columbia |
| Mid-Range, Inc. | Ontario |
| Midas Labs Co. | |
| Midas Tech | Ontario |
| Midi Solutions, Inc. | British Columbia |
| Midnight Illusions Ltd | Ontario |
| Midwest Communications | Alberta |
| Mighty GPS | Ontario |
| Mighty Loop Kelowna | |
| Mighty Oak Marketing | |
| Mighty Oaks | British Columbia |
| MigiHub | |
| Migrations.ml | |
| Mikadoweb | |
| Mike Boers | |
| Mike Cygalski | Ontario |
| Mike Doyle | Ontario |
| Mike's Computer Shop | British Columbia |
| Mikecom Computers and Electronics | Ontario |
| MikeMart Solutions | |
| Mikrolink Computers | Ontario |
| MIL Tooling and Automation, Inc. | Ontario |
| Mil-Sted Data Products Ltd | |
| Mila | Quebec |
| MilAero Electronics Atlantic, Inc. | Nova Scotia |
| Milano Software | Ontario |
| Mile Five, Inc. | |
| Milestone Software | Alberta |
| Milk Moovement | Nova Scotia |
| Milky Way Electronics Service Center | Alberta |
| Mill-Tek Office Solutions | |
| MILL3 | |
| Millennium Process Group, Inc. | |
| Millennium Systems Canada, Inc. | Alberta |
| Miller Bortenstein Consultants | Ontario |
| Million Short | |