| Competition: | Combined Counties Football League |
| Season: | 1999–2000 |
| Winners: | Ashford Town |
| Promoted: | Ashford Town |
| Matches: | 420 |
| Total Goals: | 1518 |
| Prevseason: | 1998–99 |
| Nextseason: | 2000–01 |
The 1999–2000 Combined Counties Football League season was the 22nd in the history of the Combined Counties Football League, a football competition in England.
The league featured 20 clubs from the previous season, along with one new club:
Also, Viking Sports changed their name to Viking Greenford.