The 1931 Macdonald Brier, the Canadian men's national curling championship, was held from March 3 to 5, 1931 at the Granite Club in Toronto, Ontario. Team Manitoba, skipped by Bob Gourley, captured the Brier Tankard with a round robin record of 8-1. This was Manitoba's fourth consecutive Brier championship. A tiebreaker game was played to determine the runner-up as both Ontario and Toronto finished the round robin with 6-3 records. Ontario defeated Toronto in an extra end 13-12 to finish runner-up. This was the last Brier to feature Montreal and Toronto as their own teams.