| Dates | 27 April – 17 September 1985 |
|---|---|
| Administrator | England and Wales Cricket Board |
| Cricket format | First-class cricket |
| Tournament format | League system |
| Champions | Middlesex (8th title) |
| Participants | 17 |
| Matches | 204 |
| Most runs | Derek Randall, (Nottinghamshire) 1,977 |
| Most wickets | Neal Radford, (Worcestershire) 100 |
The 1985 Britannic Assurance County Championship was the 86th officially organised running of the County Championship. Middlesex won the Championship title.
The Championship was sponsored by Britannic Assurance for the second time with the winners of the championship receiving £20,000.
| Team | P | W | L | D | Bat | Bowl | Pts | |
|---|---|---|---|---|---|---|---|---|
| 1 | Middlesex | 24 | 8 | 4 | 12 | 61 | 85 | 274 |
| 2 | Hampshire | 24 | 7 | 2 | 15 | 66 | 78 | 256 |
| 3 | Gloucestershire | 24 | 7 | 3 | 14 | 51 | 78 | 241 |
| 4 | Essex | 24 | 7 | 2 | 14 | 42 | 70 | 224 |
| 5 | Worcestershire | 24 | 5 | 6 | 13 | 65 | 68 | 221 |
| 6 | Surrey | 24 | 5 | 5 | 14 | 62 | 76 | 218 |
| 7 | Sussex | 24 | 6 | 1 | 16 | 52 | 57 | 205 |
| 8 | Nottinghamshire | 24 | 4 | 2 | 18 | 66 | 69 | 199 |
| 9 | Kent | 24 | 4 | 5 | 15 | 51 | 71 | 186 |
| 10 | Northamptonshire | 24 | 5 | 4 | 15 | 52 | 51 | 183 |
| 11 | Yorkshire | 24 | 3 | 4 | 16 | 58 | 59 | 165 |
| 12 | Glamorgan | 24 | 4 | 4 | 16 | 43 | 48 | 163 |
| 13 | Derbyshire | 24 | 3 | 7 | 14 | 46 | 69 | 163 |
| 14 | Lancashire | 24 | 3 | 7 | 14 | 44 | 67 | 159 |
| 15 | Warwickshire | 24 | 2 | 8 | 14 | 47 | 74 | 153 |
| 16 | Leicestershire | 24 | 2 | 3 | 19 | 48 | 65 | 145 |
| 17 | Somerset | 24 | 1 | 7 | 16 | 70 | 45 | 131 |