2016–17 Eastern Counties Football League
The 2016–17 season was the 74th in the history of the Eastern Counties Football League, a football competition in England.
Mildenhall Town were champions, winning their first Eastern Counties Football League title and were promoted to the Isthmian League for the first time in their history.
Premier Division
The Premier Division featured 18 clubs which competed in the division last season, along with three new clubs, promoted from the Division One:The following five clubs applied for promotion to Step 4: Felixstowe & Walton United, Mildenhall Town, Newmarket Town, Stanway Rovers.
League table
Stadia and locations
| Team | Stadium | Capacity |
| Brantham Athletic | Brantham Leisure Centre | 1,200 |
| Clacton | The Rush Green Bowl | 3,000 |
| Ely City | Unwin Sports Ground | 1,500 |
| Fakenham Town | Clipbush Park | 2,000 |
| Felixstowe & Walton United | Dellwood Avenue | 2,000 |
| Godmanchester Rovers | Bearscroft Lane | 1,050 |
| Gorleston | Emerald Park | 3,000 |
| Great Yarmouth Town | Wellesley Recreation Ground | 3,600 |
| Hadleigh United | Millfield | 3,000 |
| Haverhill Rovers | New Croft | 3,000 |
| Ipswich Wanderers | Humber Doucy Lane | 1,000 |
| Kirkley & Pakefield | Walmer Road | 2,000 |
| Long Melford | Stoneylands | |
| Mildenhall Town | Recreation Way | 2,000 |
| Newmarket Town | Cricket Field Road | 2,750 |
| Saffron Walden Town | Catons Lane | 2,000 |
| Stanway Rovers | Hawthorns | 1,500 |
| Swaffham Town | Shoemakers Lane | |
| Thetford Town | Mundford Road | 1,500 |
| Walsham-le-Willows | Summer Road | 1,000 |
| Wivenhoe Town | Broad Lane | 2,876 |
Division One
Division One featured 16 clubs which competed in the division last season, along with five new clubs:- Coggeshall Town, promoted from Essex and Suffolk Border League
- Framlingham Town, promoted from the Suffolk and Ipswich League
- Holland, promoted from the Essex and Suffolk Border League
- Whitton United, relegated from the Premier Division
- Wisbech St Mary, promoted from the Cambridgeshire County League
League table
Stadia and locations
| Team | Stadium | Capacity |
| AFC Sudbury reserves | King's Marsh | 2,500 |
| Braintree Town reserves | Cressing Road | 4,202 |
| Coggeshall Town | West Street | |
| Cornard United | Blackhouse Lane | 2,000 |
| Debenham LC | Maitlands | 1,000 |
| Dereham Town reserves | Aldiss Park | 3,000 |
| Diss Town | Brewers Green Lane | 2,500 |
| Downham Town | Memorial Field | 1,000 |
| Framlingham Town | Badingham Road | |
| Halstead Town | Rosemary Lane | 1,000 |
| Haverhill Borough | New Croft | 3,000 |
| Holland | Rush Green Bowl | 3,000 |
| King's Lynn Town reserves | The Walks | 5,733 |
| Leiston reserves | Victory Road | 2,500 |
| March Town United | The GER Sports Ground | |
| Needham Market reserves | Bloomfields | 4,000 |
| Stowmarket Town | Greens Meadow | 1,000 |
| Team Bury | Ram Meadow | 3,500 |
| Whitton United | King George V Playing Fields | 1,000 |
| Wisbech St Mary | Beechings Close | |
| Woodbridge Town | Notcutts Park | 3,000 |