The 1975 Macdonald Brier, the Canadian men's national curling championship was held from March 2 to 8, 1975 at the Lady Beaverbrook Rink in Fredericton, New Brunswick.

Team Northern Ontario, who was skipped by Bill Tetley captured the Brier tankard as they finished round robin play with a 9–2 record.

The Tetley rink would go onto represent Canada in the 1975 Air Canada Silver Broom, the men's world curling championship in Perth, Scotland where they would lose in the semifinal to eventual champion Switzerland.

Despite being a longshot to win the Brier (or even compete in general) as a first year entry, the Territories entry from Yukon, who was skipped by Don Twa remained in contention until the final draw of the tournament and eventually finished tied for second overall with an 8–3 record.

[5] The Ross Harstone Award was presented to the player chosen by their fellow peers as the curler who best represented Harstone's high ideals of good sportsmanship, observance of the rules, exemplary conduct and curling ability.