The 1975 U.S. Clay Court Championships was a combined men's and women's Grand Prix tennis tournament held in Indianapolis in the United States and played on outdoor clay courts.

It was the seventh edition of the tournament and was held from August 4 through August 11, 1975.

Third-seeded Manuel Orantes won the men's singles title and the accompanying $16,000 first prize money while Chris Evert won the women's singles title.

[3][4] Manuel Orantes defeated Arthur Ashe 6–2, 6–2 Chris Evert defeated Dianne Fromholtz 6–3, 6–4 Juan Gisbert / Manuel Orantes defeated Wojciech Fibak / Hans-Jürgen Pohmann 7–5, 6–0 Fiorella Bonicelli / Isabel Fernández defeated Gail Chanfreau / Julie Heldman 3–6, 7–5, 6–3