John Needles Bentley (March 8, 1895 – October 24, 1969) was a 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 earned run average and 259 strikeouts. Bentley was a member of the Giants' pennant-winning teams in 1923 and 1924. He was 1–3 with a 4.94 ERA and 11 strikeouts in World Series play.
He was born in Sandy Spring, Maryland and later died in Olney, Maryland at the age of 74.