Watson McLean Washburn (June 13, 1894 – December 2, 1973) was an American tennis player who was in the top 10 in the US seven times between 1914 and 1922.

[3] He was primarily a doubles player and teamed with Richard Norris Williams to take the Davis Cup in 1921.

In July 1915, Washburn and Williams won the doubles title at the Eastern Tennis Championship in Brookline defeating Irving C. Wright and Wallace F. Johnson in four sets.

[5] In 1917, Washburn joined the American Expeditionary Forces and served during World War I in France as a captain in the artillery.

[6][7] In 1921, Washburn defeated Richard Norris Williams in the final of the Newport Casino Invitational in five sets.