Percy Knapp
| Full name | Wallace Percy Knapp |
|---|---|
| Country (sports) | United States |
| Born | 7 August 1863 South Norwalk, Connecticut, United States |
| Died | August 29, 1917 (aged 54). New York City, New York, United States |
| Turned pro | 1884 (amateur tour) |
| Retired | 1903 |
| Singles | |
| Grand Slam singles results | |
| US Open | F (1885, 1890) |
| Doubles | |
| Grand Slam doubles results | |
| US Open | QF (1884) |
Wallace Percy Knapp (July 8, 1863 – August 29, 1917) was an American tennis player active in the late 19th century.
Knapp reached the All-Comers final of the U.S. National Championships in 1885 (beating Howard Taylor and Joseph Clark before losing to Godfrey Brinley) and 1890 (beating Clarence Hobart before losing to Oliver Campbell). Knapp also reached the semifinals in 1884 and 1889.