| Administrator: | Test and County Cricket Board |
| Cricket Format: | Limited overs cricket(40 overs per innings) |
| Tournament Format: | League |
| Champions: | Lancashire |
| Count: | 3 |
| Participants: | 17 |
| Matches: | 136 |
| Most Runs: | 691 Alec Stewart (Surrey) |
| Most Wickets: | 29 Kevin Saxelby (Nottinghamshire) |
| Previous Year: | 1988 |
| Previous Tournament: | 1988 Refuge Assurance League |
| Next Year: | 1990 |
| Next Tournament: | 1990 Refuge Assurance League |
The 1989 Refuge Assurance League was the twenty-first competing of what was generally known as the Sunday League. The competition was won for the third time by Lancashire County Cricket Club.
| 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 | R/R |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 16 | 12 | 0 | 2 | 1 | 1 | 52 | 4.722 | ||||||||||
| 16 | 11 | 0 | 4 | 0 | 1 | 46 | 4.991 | ||||||||||
| 16 | 11 | 0 | 4 | 1 | 0 | 46 | 4.576 | ||||||||||
| 16 | 9 | 0 | 6 | 0 | 1 | 38 | 4.691 | ||||||||||
| 16 | 9 | 0 | 6 | 0 | 1 | 38 | 4.257 | ||||||||||
| 16 | 8 | 1 | 6 | 1 | 0 | 36 | 4.339 | ||||||||||
| 16 | 8 | 0 | 6 | 1 | 1 | 36 | 4.366 | ||||||||||
| 16 | 9 | 0 | 7 | 0 | 0 | 36 | 4.912 | ||||||||||
| 16 | 8 | 1 | 7 | 0 | 0 | 34 | 4.195 | ||||||||||
| 16 | 7 | 1 | 8 | 0 | 0 | 30 | 5.030 | ||||||||||
| 16 | 7 | 0 | 9 | 0 | 0 | 28 | 4.753 | ||||||||||
| 16 | 6 | 1 | 8 | 1 | 0 | 28 | 4.751 | ||||||||||
| 16 | 7 | 0 | 9 | 0 | 0 | 28 | 4.810 | ||||||||||
| 16 | 5 | 0 | 10 | 0 | 1 | 22 | 4.082 | ||||||||||
| 16 | 5 | 0 | 10 | 0 | 1 | 22 | 4.730 | ||||||||||
| 16 | 2 | 0 | 12 | 1 | 1 | 12 | 4.612 | ||||||||||
| 16 | 3 | 0 | 13 | 0 | 0 | 12 | 4.342 | ||||||||||
| Team marked | |||||||||||||||||