| DarkVision | British Columbia |
| Darn Computers | Saskatchewan |
| Darner Media | Ontario |
| Dartmouth Ocean Technologies, Inc. | Nova Scotia |
| Darwin AI | Ontario |
| DarwinAI | Ontario |
| Darwwwin | |
| DASAN Research Corporation | British Columbia |
| Dash Creative Branding | Nova Scotia |
| Dash Social | |
| DashThis | Quebec |
| DASLWEB | Quebec |
| Dasro | |
| Dastech Systems, Inc. | |
| Dasweb | |
| Data & Scientific, Inc. | Ontario |
| Data Access Technologies, Inc. | Ontario |
| Data Arch | Ontario |
| Data Axle, Inc. | |
| Data Card Alberta Ltd | Alberta |
| Data Centre Design, Inc. | Alberta |
| Data Communications Management Corporation | Ontario |
| Data Control Management Solutions Ltd | Alberta |
| Data Deposit Box | Ontario |
| Data First Computers, Inc. | Ontario |
| Data Generation | British Columbia |
| Data Informatique | Quebec |
| Data Insight | Ontario |
| Data Integrity, Inc. | Ontario |
| Data Kinetics Ltd | Ontario |
| Data Lab 247 | Ontario |
| Data Nerds | British Columbia |
| Data Perceptions | Ontario |
| Data Power | British Columbia |
| Data Recovery Canada | Ontario |
| Data Recovery Expert Services Canada | Alberta |
| Data Recovery Pro | British Columbia |
| Data Repro Com Ltd | Ontario |
| Data Rescue Labs, Inc. | Ontario |
| Data Roots | British Columbia |
| Data Science Jobs Canada | |
| Data Sciences | |
| Data Sciencing Consultants | |
| Data Ventures Corporation | Ontario |
| Data Village | Alberta |
| Data Wiring Solutions, Inc. | New Brunswick |
| Data-Recovery-Vancouver.com | British Columbia |
| DataAnywhere.net | British Columbia |
| Dataaxy | |
| Databank I.T. Solutions, Inc. | Ontario |