| 1341 | T.Y.Lin International Canada Inc. (formerly TMIG) | Whitby |
| 1342 | T2 Utility Engineers Inc. | Edmonton |
| 1343 | T2 Utility Engineers Inc. | Nepean |
| 1344 | T2 Utility Engineers Inc. | Oakville |
| 1345 | T2 Utility Engineers Inc. | Whitby |
| 1346 | T2 Utility Engineers Inc. | Whitby |
| 1347 | Tacoma Engineers Inc. | Guelph |
| 1348 | Tacoma Engineers Inc. | Barrie |
| 1349 | Tacoma Engineers Inc. | Waterloo |
| 1350 | Tate Engineering | Fall River |
| 1351 | Tatham Engineering Limited | Barrie |
| 1352 | Tatham Engineering Limited | Bracebridge |
| 1353 | Tatham Engineering Limited | Collingwood |
| 1354 | Tatham Engineering Limited | Orillia |
| 1355 | Tatham Engineering Limited | Ottawa |
| 1356 | Taylor Architecture Group | Yellowknife |
| 1357 | Tecsar Engineering Inc. | Sarnia |
| 1358 | Tek Consultants Limited | Fredericton |
| 1359 | Tetra Tech Canada Inc. | Edmonton |
| 1360 | Tetra Tech Canada Inc. | Alma |
