The 1975 U.S. Pro Indoor was a men's WCT tennis tournament played on indoor carpet courts at the Spectrum in Philadelphia, Pennsylvania in the United States. It was the eight edition of the tournament and was held from January 20 through January 26, 1975. Seventh-seeded Marty Riessen won the singles title.
Finals
Singles
Marty Riessen defeated Vitas Gerulaitis 7–6(7–1), 5–7, 6–2, 6–7(0–7), 6–3
It was Riessen's only title of the year and the 41st of his career.
Doubles
Brian Gottfried / Raúl Ramírez defeated Dick Stockton / Erik van Dillen 3–6, 6–3, 7–6(7–4) It was Gottfried's 1st title of the year and the 9th of his career. It was Ramirez's 2nd title of the year and the 12th of his career.