John Curtis Chapman (May 8, 1843 – June 10, 1916) was an American Major League Baseball player and manager who was born in Brooklyn, New York.

After the 1877 season, the Louisville team was expelled from the National League, and Chapman became manager of the Milwaukee Grays.

The team faced the Brooklyn Bridegrooms of the National League that would be held as a best-of-seven series.

Louisville won two out of the next three to force a seventh game amidst worsening weather conditions.

Louisville won 6–2, but the agreement between the AA and the NL floundered in the winter, meaning that no true winner of the 1890 Series was awarded that year.