| Billy Clifford | |
| Fullname: | William Clifford |
| Birth Place: | Plymouth, Massachusetts, United States |
| Position: | Defender |
| Youthyears1: | 1992–1995 |
| Youthclubs1: | South Carolina Gamecocks |
| Years1: | 1996 |
| Clubs1: | South Carolina Shamrocks |
| Goals1: | 2 |
| Years2: | 1997–1998 |
| Clubs2: | Jacksonville Cyclones |
| Caps2: | 19 |
| Goals2: | 1 |
William Clifford is a retired American professional soccer defender who spent three seasons in the USISL.
In 1992, Clifford graduated from Sacred Heart High School.[1] He attended the University of South Carolina, playing on the men's soccer team from 1992 to 1995.[2] In 1996, he turned professional with the South Carolina Shamrocks of the USISL.[3] On February 2, 1997, the Columbus Crew selected Clifford in the third round (twenty-eighth overall) of the 1997 MLS Supplemental Draft. The Crew released him and he moved to the Jacksonville Cyclones for two seasons. In April 1998, Clifford suffered a career ending broken foot during practice.[4]