Roger Connor (July 1, 1857 - January 4, 1931) was a 19th century Major League Baseball player. Prior to Babe Ruth, Connor was professional baseball's home run king, having hit 138 round-trippers over his 18 year career.
Connor entered the National League in 1880 as a member of the Troy Trojans. He later played for the New York Gothams, and, due to his great stature, gave that team the enduring nickname "Giants". He was regularly among the league leaders in batting average and home runs until his retirement in 1897. Although he only led the league in home runs once, in 1890, Connor's career mark of 138 was a benchmark not surpassed until 1921 by Babe Ruth. He finished his career with a .317 batting average.
Connor is credited with being the first player to hit a grand slam in league history and being the first to hit an over-the-wall home run at the Polo Grounds.
Connor was inducted into the Baseball Hall of Fame in 1976.