| 381 | CTM Design Services Ltd. | Calgary |
| 382 | CTQ Consultants | Kelowna |
| 383 | CVL Engineers Inc. | Edmonton |
| 384 | Cyril J. Demeyere Limited | Tillsonburg |
| 385 | D-Code Engineering Ltd. | Saskatoon |
| 386 | D.E.S. Engineering Limited | Edmonton |
| 387 | D.G. Biddle & Associates Limited | Oshawa |
| 388 | D.G. Biddle & Associates Limited | Peterborough |
| 389 | D.M. Wills Associates Limited | Bancroft |
| 390 | D.M. Wills Associates Limited | Peterborough |
| 391 | Daniels Wingerak Engineering Ltd. | Saskatoon |
| 392 | Daniels Wingerak Engineering Ltd. | Saskatoon |
| 393 | David Nairne & Associates Ltd. | North Vancouver |
| 394 | David Schaeffer Engineering Ltd. | Markham |
| 395 | David Schaeffer Engineering Ltd. | Ottawa |
| 396 | Davroc & Associates Ltd. | Brampton |
| 397 | DBA Experts Conseils Inc | Repentigny |
| 398 | Dearden and Stanton Limited | Orillia |
| 399 | DECAST Ltd. | Utopia |
| 400 | Deltek Inc. | Toronto |
