Robert Edward "Bob" Addy (February 1845 – April 9, 1910), nicknamed "The Magnet", was an American right fielder and second baseman in Major League Baseball, whose professional career spanned from 1871 in the National Association to 1877 in the National League. He is credited as the first player to introduce the slide in an organized game, and later attempted to create a game of baseball that would have been played on ice.

Born in Port Hope, Ontario, he is credited with employing the first slide in an organized baseball game, while playing for the 1866 Rockford Forest Citys of the National Association of Base Ball Players. He was still playing for the Forrest Citys in 1869, and was with them two years later when Rockford joined the first all-professional league, the National Association of Professional Base Ball Players.

Rockford lasted just the one season in the Association, and Addy did not rejoin the league until 1873 when he joined the . He played in ten games as player-manager, before moving on and joining the Boston Red Stockings later in the season. He helped the Red Stockings win the league title that year, playing in right field, hitting .355, and finished ninth in the league with a .354 on-base percentage. On January 20, 1874, the National Association's Judiciary Committee met to discuss, among other things, charges that Addy had joined the Boston Red Stockings before 60 days had elapsed since leaving the Philadelphia club. He was acquitted of the charge and was allowed to play.

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