The 1977 U.S. Pro Indoor was a men's tennis tournament played on indoor carpet courts that was part of the World Championship Tennis (WCT) circuit. It was played at the Wachovia Spectrum in Philadelphia, Pennsylvania in the United States. It was the 10th edition of the tournament and was held from January 24 through January 30, 1977. won the singles title while Bob Hewitt and Frew McMillan won the men's doubles. Total attendance for the tournament was 81,798.

defeated Jimmy Connors 3–6, 6–4, 3–6, 6–1, 6–2

Bob Hewitt / Frew McMillan defeated Wojciech Fibak / Tom Okker 6–1, 1–6, 6–3

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