James Charles Bethke (born November 5, 1946) is an American former Major League Baseball pitcher.
He was signed by the New York Mets in 1964. He only played one season in his career, which was 1965 with the Mets. His career statistics are 25 games played (all of which he entered in relief and 12 of which he finished), 19 strikeouts, a 4.28 earned run average, and a 2–0 win–loss record.
He was the youngest player in the major leagues at the time in 1965 at age 18.