National & international

North American Mycological Association

Mycological Society of America

Atlantic Canada

Société MycoNB Society

Foray Newfoundland and Labrador

Mushrooms of PEI Citizen Science Project - not an organization, but a project coordinated by Nature PEI that also features fungal news and events specific to PEI.

Quebec

Champignons du Québec

Cercle des Mycologues de Montréal