The 1939 U.S. Open was the 43rd U.S. Open, held June 8–12 at Philadelphia Country Club in Gladwyne, Pennsylvania, a suburb northwest of Philadelphia. Byron Nelson won after two playoff rounds to prevail against Craig Wood and Denny Shute to claim his only U.S. Open title, and the second of his five major championships. It was the first playoff at the U.S. Open in eight years and the first three-way playoff since 1913.