| Administrator: | Test and County Cricket Board |
| Cricket Format: | Limited overs cricket(40 overs per innings) |
| Tournament Format: | League |
| Champions: | Nottinghamshire |
| Count: | 1 |
| Participants: | 17 |
| Matches: | 136 |
| Most Runs: | 917 Tom Moody (Worcestershire) |
| Most Wickets: | 30 Franklyn Stephenson (Sussex) |
| Previous Year: | 1990 |
| Previous Tournament: | 1990 Refuge Assurance League |
| Next Year: | 1992 |
| Next Tournament: | 1992 Sunday League |
The 1991 Refuge Assurance League was the twenty-third competing of what was generally known as the Sunday League. The competition was won for the first time by Nottinghamshire County Cricket Club.
Somerset played Lancashire at Taunton on Friday 5 July 1991 to be the first Sunday League game not to be played on a Sunday.[1]
Nottinghamshire beat Derbyshire, the previous seasons champions, in the final round of matches at Trent Bridge to claim the title. Tom Moody of Worcestershire had an excellent season scoring a record 917 runs (including 5 centuries).
| width=200 | Team | width=20 | Pld | width=20 | W | width=20 | T | width=20 | L | width=20 | N/R | width=20 | A | width=20 | Pts | width=60 | Rp100 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nottinghamshire (C) | 16 | 13 | 0 | 3 | 0 | 0 | 52 | 83.471 | |||||||||
| 16 | 12 | 0 | 3 | 1 | 0 | 50 | 89.781 | ||||||||||
| 16 | 10 | 0 | 4 | 1 | 1 | 44 | 86.264 | ||||||||||
| 16 | 9 | 1 | 4 | 2 | 0 | 42 | 95.162 | ||||||||||
| 16 | 8 | 1 | 4 | 1 | 2 | 40 | 82.534 | ||||||||||
| 16 | 7 | 1 | 4 | 2 | 2 | 38 | 84.419 | ||||||||||
| 16 | 9 | 0 | 7 | 0 | 0 | 36 | 86.388 | ||||||||||
| 16 | 7 | 0 | 7 | 1 | 1 | 32 | 80.858 | ||||||||||
| 16 | 7 | 0 | 7 | 1 | 1 | 32 | 81.945 | ||||||||||
| 16 | 6 | 1 | 8 | 0 | 1 | 28 | 87.460 | ||||||||||
| 16 | 6 | 0 | 9 | 0 | 1 | 26 | 79.150 | ||||||||||
| 16 | 5 | 0 | 9 | 1 | 1 | 24 | 76.146 | ||||||||||
| 16 | 5 | 0 | 9 | 1 | 1 | 24 | 81.421 | ||||||||||
| 16 | 5 | 0 | 10 | 0 | 1 | 22 | 78.291 | ||||||||||
| 16 | 5 | 0 | 11 | 0 | 0 | 20 | 84.389 | ||||||||||
| 16 | 4 | 0 | 10 | 2 | 0 | 20 | 82.610 | ||||||||||
| 16 | 3 | 0 | 12 | 1 | 0 | 14 | 79.242 | ||||||||||
| Team marked | |||||||||||||||||