| Device Functions | Ontario |
| Device Media, Inc. | Alberta |
| DeviceDoctor.com | British Columbia |
| DEVICOM, Inc. | Quebec |
| Devinity | |
| DevIT Group | |
| Devlift | |
| Devocean, Inc. | Quebec |
| Devolutions | Quebec |
| Devolutions, Inc. | Quebec |
| Devolve | Alberta |
| Devon J Andrew Design, Inc. | Ontario |
| Devondev | Ontario |
| Devrun | Quebec |
| Devsights | |
| DevsTree | |
| DevTalent, Inc. | Ontario |
| DevTst Solutions, Inc. | |
| Devzeta | |
| DeWave Software, Inc. | British Columbia |
| DEXAGON, Inc. | Ontario |
| Dexco Corporation | Quebec |
| Dexero | Quebec |
| Dextel.net | Quebec |
| DEXTRASEO | |
| Dezynetek Digital Design | Alberta |
| DF Computer Centre | Ontario |
| DF Consulting | British Columbia |
| DFC International Ltd | Ontario |
| DGC Solutions, Inc. | Quebec |
| DGControl Software | Ontario |
| DGK.ca | Quebec |
| DGS Web Solutions | Ontario |
| Dhan Systems Management Ltd | Ontario |
| Dhottech | |
| Di-O-Matic, Inc. | Quebec |
| DIA Labs Canada | |
| Dia Media | British Columbia |
| Diabsolut | Ontario |
| Diagnos | Quebec |
| Diagnostics Biochem Canada, Inc. | |
| Diagonal Systems, Inc. | Quebec |
| Diagram | Quebec |
| Dial A Geek Consulting | British Columbia |
| Dial Tone Communications, Inc. | Ontario |
| Dialect | British Columbia |
| Dialecte | |
| Dialecto Web, Inc. | Quebec |
| Dialed In Design | British Columbia |
| Dialekta | Quebec |