| John W. Erwin | |
| Birth Date: | 5 April 1894 |
| Birth Place: | Spartanburg, South Carolina, U.S. |
| Death Place: | Spartanburg, South Carolina, U.S. |
| Player Sport1: | Basketball, tennis |
| Player Years1: | 1911–1914 |
| Player Team1: | Clemson |
| Coach Sport1: | Basketball |
| Coach Years2: | 1913–1915 |
| Coach Team2: | Clemson |
John Watson Erwin (April 5, 1894–March 3, 1972) was an American college basketball coach. Born in Spartanburg, South Carolina, in 1894, he attended Clemson College from 1911 to 1914, where he excelled in both tennis and basketball. Alongside his brother James, he won the Southern Intercollegiate Athletic Association doubles championship in 1913.[1] Erwin played on Clemson's first basketball team in 1912, and was captain and player-coach in the 1914 season. He also coached the 1915 team. After leaving Clemson, he ran a grocery wholesaler in Spartanburg, and died in 1972.[2]