The 2002–03 Combined Counties Football League season was the 25th in the history of the Combined Counties Football League, a football competition in England. It was AFC Wimbledon's first season as a fan owned club, having reformed after Wimbledon FC opted to move to Milton Keynes and became the MK Dons.
AFC Wallingford's 115 points without winning the league is considered the most points ever accumulated by a runner-up in any football league.[1] AFC Wimbledon's 111 points is the second most points ever won by a non-winner in any football league competition.
| Competition: | Combined Counties Football League |
| Season: | 2002–03 |
| Winners: | Withdean 2000 |
| Matches: | 552 |
| Total Goals: | 2036 |
| Prevseason: | 2001–02 |
| Nextseason: | 2003–04 |
The league featured 21 clubs from the previous season, along with three new clubs: