| Abitibi Metals Corp | London | Exploration | |
 | ABITIBI-GÉOPHYSIQUE INC. | VAL-D'OR | Geophysical services | |
| ACCÉLÉRATEUR DE COMMERCIALISATION D'INNOVATION MINIÈRE (ACIM) | Cantley | | |
 | ACTIVATION LABORATORIES LTD. (ACTLABS) | Ancaster | Laboratories | |
 | ADRIA POWER SYSTEMS | ROUYN-NORANDA | Other | |
 | AGAT LABORATOIRES | CALGARY | Laboratories | |
| AGENCE DU REVENU DU CANADA | Rouyn-Noranda | | |
 | AIR INUIT LTÉE | MONTRÉAL | Air transportation | |
 | Air Tunilik | Laval | Air transportation | |
 | AIRMEDIC | SAINT-HUBERT | Air transportation | |
| ALASKA STRUCTURES | ANCHORAGE | | |
| ALEXANDR BELOBORODOV GÉOLOGUE INC. | LAVAL | Geophysical services | |
 | ALS GÉOCHIMIE | VAL-D’OR | Laboratories | |
| AMAUCU MINING CORP | THUNDER BAY | | |
 | AMEX EXPLORATION | MONTRÉAL | Exploration | |
| ANALYTICAL SOLUTIONS LTD. | SUDBURY | | |
| ARCELORMITTAL EXPLOITATION MINIÈRE CANADA | Fermont | | |
 | ARCHER EXPLORATION CORP. | VANCOUVER | Exploration | |
 | Arianne Phosphate | Chicoutimi | Exploration | |
| ARKYS SYSTÈME | VAL D’OR | Other | |
 | ASDR CANADA INC. | MALARTIC | Consulting Engineering and Construction | |
| ASDR TRAITEMENT D'EAU | LAVAL | | |
 | ASSOCIATION DES PRODUCTEURS DE TOURBE HORTICOLE DU QUÉBEC (APTHQ) | RIVIÈRE-DU-LOUP | Association and non-profit organization | sboudreau@tourbehorticole.com |
| ASSOCIATION DES PROSPECTEURS DE LA MANICOUAGAN | | | |
| ASSOCIATION MINIÈRE DU QUÉBEC | Québec | | |
 | ATELIER VAL-D'OR | VAL-D'OR | Drilling | fbeauchesne@avddrills.com |
| AUXICO RESSOURCES CANADA INC | Montréal | | |
| AVATAA EXPLORATIONS & LOGISTICS INC. | Kuujjuaq | | |
 | AVJET HOLDING INC. | DRUMMONDVILLE | Air transportation | |
 | AXIS MINING TECHNOLOGY | MARKHAM | Drilling | |
