John Van Ryn (June 30, 1905 – August 7, 1999) was an American tennis champion of the 1930s. He was primarily known as the doubles partner of Wilmer Allison. Van Ryn won the Men's Doubles at Wimbledon three straight years (1929–31). He took two of the titles with Wilmer Allison and won the third with George Lott. In 1931, he was also successful with Lott at the French Championships. He became the first male player to win the French, British and American doubles titles when he won the 1931 U.S. National Championships with Allison. Van Ryn had an excellent record when he competed for the United States in Davis Cup, winning 22 of 24 encounters in a period of eight years. He was inducted into the Tennis Hall of Fame in 1963.