Watson Washburn (13 June 1894 – 2 December 1973) was an American tennis player who was in the top 10 in the US seven times between 1914 and 1922. He was also one of the founders of the International Tennis Hall of Fame, to which he was inducted in 1965.
Born in New York City, he was primarily a doubles player and teamed with Richard Norris Williams to take the Davis Cup in 1921. Also with Williams, he reached two US Championship finals and one at Wimbledon. He won the US Intercollegiate Doubles Championship in 1913 and the Indoor Doubles Championship in 1915.