The 1889 Louisville Colonels season was a season in American baseball. The team finished with a 27–111 record, last in the American Association. The Colonels were the first Major League team to lose more than 100 games in a season. The previous record for losses was 92, set by the Washington Nationals in 1886 and matched by the Cleveland Blues in 1887. The record would be broken again in 1890 by the Pittsburg Alleghenys, but remained the AA record until the league folded in 1891.