1973 U.S. Professional Indoor
| 1973 U.S. Professional Indoor | |
|---|---|
| Date | February 6–11 |
| Edition | 6th |
| Category | World Championship Tennis |
| Draw | 32S / 16D |
| Prize money | $50,000 |
| Surface | Carpet / indoor |
| Location | Philadelphia, PA, United States |
| Venue | Wachovia Spectrum |
| Champions | |
| Singles | |
 Stan Smith [1] | |
| Doubles | |
| Brian Gottfried / Dick Stockton [2] | |
The 1973 U.S. Professional Indoor was a WCT men's tennis tournament played on indoor carpet courts at the Wachovia Spectrum in Philadelphia, Pennsylvania in the United States. It was the sixth edition of the tournament and was held from February 6 through February 11, 1973. Third-seeded Stan Smith won the singles title.
Finals
Singles
Stan Smith defeated Robert Lutz 7–6(7–2), 7–6(7–5), 4–6, 6–4
- It was Smith's 1st title of the year and the 28th of his career.
Doubles
Brian Gottfried / Dick Stockton defeated 
Roy Emerson / Rod Laver 4–6, 6–3, 6–4
- It was Gottfried's 1st title of the year and the 1st of his career. It was Stockton's 1st title of the year and the 1st of his career.