| 61 | Ainley Group | Kingston |
| 62 | Aiolos Engineering Corporation | Toronto |
| 63 | Akron Engineering Consultant's Group Ltd. | Fort McMurray |
| 64 | Al-Terra Engineering (Red Deer) Ltd. | Red Deer |
| 65 | Al-Terra Engineering Ltd. | Edmonton |
| 66 | ALFA Engineering Ltd. | Regina |
| 67 | Allnorth Consultants Limited | Vancouver |
| 68 | Allnorth Consultants Limited | Calgary |
| 69 | Allnorth Consultants Limited | Dartmouth |
| 70 | Allnorth Consultants Limited | Edmonton |
| 71 | Allnorth Consultants Limited | Fort Nelson |
| 72 | Allnorth Consultants Limited | Grande Prairie |
| 73 | Allnorth Consultants Limited | Phoenix |
| 74 | Allnorth Consultants Limited | Prince George |
| 75 | Allnorth Consultants Limited | Saskatoon |
| 76 | Allnorth Consultants Limited | St John's |
| 77 | Almor Testing Services Ltd. | Calgary |
| 78 | AMR Group Ltd. | Toronto |
| 79 | Anrep Krieg Desilets Gravelle Ltd. | North Bay |
| 80 | Aplin Martin | Calgary |
