The 1942 Macdonald Brier, the Canadian men's national curling championship, was held from March 2 to 5, 1942 at Quebec Arena in Quebec City, Quebec. Team Manitoba, who was skipped by Ken Watson won the Brier Tankard by finishing round robin play with an 8-1 record. This was Manitoba's tenth Brier championship overall and the second Brier won by Watson's rink, who won their first Brier in 1936. For the first time since the 1933 Brier, none of the games went to an extra end. Conditions at the Arena were considered "tricky, almost unplayable".