The 1890 Rochester Broncos season was the team's only season in Major League Baseball. In 1889, the team had played in the minor league International Association as the Rochester Jingoes. The Broncos went 63–63 during the season and finished 5th in the American Association. They went 40–22 at home, but 23–41 on the road. After the season, the team returned to the minor leagues, moving to the Eastern Association as the Rochester Hop Bitters.

The following are the baseball events of the year 1890 throughout the world.