The 1991 Montreal Expos season was the 23rd season in franchise history. After several winning seasons, the Expos faltered in 1991, winning only 20 of its first 49 games. Manager Buck Rodgers was replaced as manager by Tom Runnells. The team ultimately finished 71-90. The highlight of the season was Dennis Martinez pitching a perfect game at Dodger Stadium on July 28, 1991.