| Dialexia | Quebec |
| Diallog Telecommunications | Ontario |
| Dialog Insight | Quebec |
| Dialog Medical Systems, Inc. | British Columbia |
| Dialogue Conferencing, Inc. | Quebec |
| Dialoguenet.ca | Quebec |
| Dialtech Solutions, Inc. | |
| diaMentis | |
| Diamond Edge Ventures | |
| Diamond L Consulting | Ontario |
| Dianne Skoll | |
| Diasc | Quebec |
| Diastolic Robotics | |
| DICA Electronics Ltd | Ontario |
| DICI Industries | |
| Didjet, Inc. | Quebec |
| Dieno Digitial | |
| Diff | Quebec |
| Diff Media | |
| Diffraction Ltd | Ontario |
| Diffusio | |
| Diffusion Fermont | |
| Difinity Solutions | |
| Dig Insights | Ontario |
| Diga Design | |
| Digerati Consulting | |
| Digi-Centre | |
| Digi-Tribe Communications | Ontario |
| Digi117.com | British Columbia |
| Digia Technology | |
| DigiAccel Marketing | Nova Scotia |
| DigiBandit IT Services | |
| DigiBC | British Columbia |
| digibee.net | Ontario |
| DigiBenders, Inc. | |
| Digibox Store Canada | Quebec |
| Digicann Ventures, Inc. | |
| Digico fabrication électronique, Inc. | |
| Digicom | Quebec |
| DigiCom WebDesign | British Columbia |
| Digid, Inc. | |
| Digifab | |
| Digiflex | Alberta |
| Digify SEO Company | |
| DigiHub Shawinigan | Quebec |
| DigiHype Media, Inc. | |
| Digilite Web Solutions | Ontario |
| DigiMarCon Canada East | |
| DigiMarCon Canada West | |
| Digimed Innovation | Quebec |