| Datex Billing Services, Inc. | Ontario |
| Datifex, Inc. | Ontario |
| DatingScript | Ontario |
| Datolite Solutions | |
| Datrox Computer Technologies, Inc. | Quebec |
| Dave Bush Media Design | Ontario |
| Davetek Marketing, Inc. | British Columbia |
| Davey Optical Equipment Repair Service | Ontario |
| Davicom | Quebec |
| David & Goliath | Quebec |
| David Berman Communications | Ontario |
| David Burnham | Ontario |
| David Howse Marketing | |
| David Johnston Research+Technology park University of Waterloo | Ontario |
| David Watters Computer Consultant | |
| Davidson Violette & Associates | Ontario |
| Davies Consulting, Inc. | Alberta |
| Davies Enterprises Ltd | Nova Scotia |
| Davin Technical Services | Ontario |
| Davis | |
| DavisDesigns | Ontario |
| Davison PC Pros | |
| Dawson College | Quebec |
| Dawson College - Computer Science Technology | Quebec |
| Daxtech | British Columbia |
| Daydream Technology, Inc. | |
| Dazil Internet Services, Inc. | British Columbia |
| DB lectro, Inc. | Quebec |
| DB Streams, Inc. | Ontario |
| DBI Technologies, Inc. | Manitoba |
| DBM Systems Ltd | |
| DBngin | |
| DBR Informatique | Quebec |
| DbWrench | British Columbia |
| Dbxperts | Alberta |
| dcbel, Inc. | |
| DCCPER Holdings Ltd | Ontario |
| dcDigital | Ontario |
| DCI Consultants | Quebec |
| DCI Digital Communications, Inc. | Ontario |
| DCI Technologies, Inc. | Alberta |
| DCI Telecom, Inc. | Quebec |
| DCOMM | Quebec |
| DCS Technologies, Inc. | British Columbia |
| DCS Telecom Ltd | Ontario |
| DCSIL | |
| DDP Consulting Group | British Columbia |
| DDS Wireless International, Inc. | British Columbia |
| De Groot Technical & Management Solutions, Inc. | Ontario |
| DE SEO Consulting | |