The 1970 Washington Star International was a men's tennis tournament and was played on outdoor clay courts.

It was the second edition of the tournament and was part of the 1970 Grand Prix circuit and categorized as a Class 2 event.

It was held at the Rock Creek Park in Washington, D.C. from July 13 through July 19, 1970.

Cliff Richey won the singles title and earned a $7,000 first prize.

[3][4] Cliff Richey defeated Arthur Ashe 7–5, 6–2, 6–1 Bob Hewitt/ Frew McMillan defeated Ilie Năstase / Ion Țiriac 7–5, 6–0