The 1975 Washington Star International was a men's tennis tournament and was played on outdoor clay courts.

It was categorized as an AA tournament and was part of the 1975 Grand Prix circuit.

Guillermo Vilas won the singles title and $16,000 prize money and a car in a final that was twice interrupted due to rain.

[4] Ilie Năstase was disqualified in his quarterfinal match against Cliff Richey for failing to resume play.

[4][5] Guillermo Vilas defeated Harold Solomon 6–1, 6–3 Bob Lutz / Stan Smith defeated Brian Gottfried / Raúl Ramírez 7–5, 2–6, 6–1