The 1971 Washington Star International was a men's tennis tournament and was played on outdoor clay courts. The event was the third edition of the tournament and was part of both the 1971 Grand Prix circuit and 1971 World Championship Tennis circuit. It was held in Washington, D.C. from July 12 through July 18, 1971. Ken Rosewall won the singles title and earned a $10,000 first prize.
Ken Rosewall defeated Marty Riessen 6–2, 7–5, 6–1
Tom Okker / Marty Riessen defeated Bob Carmichael / Ray Ruffels 7–6, 6–2