The 1934 Macdonald Brier, the Canadian men's national curling championship, was held from March 6 to 8, 1934 at the Granite Club in Toronto, Ontario.
Team Manitoba who was skipped by Leo Johnson finished round robin play undefeated with a 7-0 record to take Manitoba's sixth Brier Tankard. Johnson's rink became the second team to finish Brier play undefeated after fellow Manitoban team Gordon Hudson was the first back in . Manitoba won the event in their last game, when they defeated Ontario in front of 2,000 fans. Tied in the last end, Johnson made a "dramatic last rock draw" to win the game.
Ontario's 26-2 victory over Nova Scotia in Draw 1 set Brier records at the time for the most points scored in a game by one team (26) and for the largest margin of victory (24).
The teams are listed as follows: