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| Founded | 1935 |
|---|---|
| Country | England |
| Divisions | Premier Division (1935–present) Division One (North) (1988–present) Division One South (2018–present) |
| Number of teams | 20 in Premier 21 in North 22 in South |
| Level on pyramid | Levels 9–10 |
| Feeder to | Isthmian League Division One North Northern Premier League Division One Midlands (from Premier Division) |
| Relegation to | Anglian Combination Cambridgeshire League Essex Alliance League Essex & Suffolk Border League Essex Olympian League Peterborough and District League Suffolk & Ipswich League |
| Domestic cup(s) | League Cup First Division Cup |
| Current champions | Ipswich Wanderers (Premier Division) Heacham (Division One North) Frenford (Division One South) (2022–23) |
| Website | thurlownunnleague |
| Current: 2023–24 Eastern Counties Football League | |
The Eastern Counties Football League, currently known as the Thurlow Nunn League for sponsorship purposes, is an English football league at levels 9 and 10 of the English football league system. It currently contains clubs from Norfolk, Suffolk, Essex, Cambridgeshire, eastern Hertfordshire, southern Lincolnshire, and north and east London. The league is a feeder to Division One North of the Isthmian League, but may also see sides promoted to the Northern Premier League Midlands Division.