John "Needles" Bentley (March 8, 1895 – October 24, 1969) was an American professional baseball player.

He was a left-handed pitcher over parts of nine seasons (1913–1916, 1923–1927) with the Washington Senators, New York Giants and Philadelphia Phillies.

For his career, he compiled a 46–33 record in 138 appearances, with a 4.01 ERA (earned run average) and 259 strikeouts.

It was thought that he would claim exemption from military service as a conscientious objector due to his religious faith, yet he chose to enlist in the army and serve his country in World War I.

This biographical article relating to an American baseball pitcher born in the 1890s is a stub.