The 2001–02 Southern Football League season was the 99th in the history of the league, an English football competition.
Kettering Town won the Premier Division and earned promotion to the Football Conference. Newport (Isle of Wight), King's Lynn, Merthyr Tydfil and Salisbury City were relegated from the Premier Division, whilst Hastings Town, Halesowen Town, Grantham Town and Chippenham Town were promoted from the Eastern and Western Divisions, the former two as champions. Wisbech Town were relegated to the eighth level and Bilston Town resigned and dropped to the ninth level, whilst Bloxwich United of the Western Division folded during the season and their record was expunged.
The Premier Division consisted of 22 clubs, including 17 clubs from the previous season and six new clubs:
| Competition: | Southern Football League Premier Division |
| Season: | 2001–02 |
| Winners: | Kettering Town |
| Promoted: | Kettering Town |
| Relegated: | Newport (Isle of Wight) King's Lynn Merthyr Tydfil Salisbury City |
| Matches: | 462 |
| Total Goals: | 1341 |
| Prevseason: | 2000–01 |
| Nextseason: | 2002–03 |
The Eastern Division consisted of 22 clubs, including 18 clubs from the previous season and four new clubs:
Also, Langney Sports changed name to Eastbourne Borough.
At the end of the season Hastings Town changed name to Hastings United.
| Competition: | Southern Football League Eastern Division |
| Season: | 2001–02 |
| Winners: | Hastings Town |
| Promoted: | Hastings Town Grantham Town |
| Relegated: | Wisbech Town |
| Matches: | 462 |
| Total Goals: | 1442 |
| Prevseason: | 2000–01 |
| Nextseason: | 2002–03 |
The Western Division consisted of 22 clubs, including 17 clubs from the previous season and five new clubs:
| Competition: | Southern Football League Western Division |
| Season: | 2001–02 |
| Winners: | Halesowen Town |
| Promoted: | Chippenham Town Halesowen Town |
| Matches: | 420 |
| Total Goals: | 1237 |
| Prevseason: | 2000–01 |
| Nextseason: | 2002–03 |