The 1971 U.S. Professional Indoor was a WCT and Virginia Slims Circuit tennis tournament played on indoor carpet courts. It was played at the Wachovia Spectrum in Philadelphia, Pennsylvania in the United States. It was the fourth edition of the tournament and was held from February 9 through February 14, 1971.
John Newcombe defeated Rod Laver 7–6(7–5), 7–6(7–1), 6–4 
- It was Newcombe's 1st title of the year and the 12th of his professional career.
Rosie Casals defeated Françoise Dürr 6–2, 3–6, 6–2
Template:1971 Virginia Slims circuit