The Tunnelling Association of Canada (commonly abbreviated to TAC) is under the umbrella of the International Tunnelling Association (referred to as the ITA).

The objectives of TAC are as follows:

(a) To promote and advance Canadian tunnelling and underground excavation technologies, and safe design, construction and maintenance;
(b) To facilitate the exchange of information on related activities and technical developments;
(c) To represent the interests of the tunnelling and underground excavation community in matters of technical and public concerns;
(d) To encourage the development and use of subsurface space;
(e) To act as an intermediary body between ITA and those individuals and organizations in Canada who are interested in tunnels and underground excavations;
(f) To disseminate throughout Canada the news of the activities of ITA and the technical information available as a result of those activities;
(g) To maintain and publish a Canadian Register of tunnels, under ground excavations and similar works.