1990 Refuge Assurance League

The 1990 Refuge Assurance League was the twenty-second competing of what was generally known as the Sunday League. The competition was won for the first time by Derbyshire County Cricket Club.

Refuge Assurance Cup
Following the end of the Sunday League season, the top four teams in the Sunday League competed for the Refuge Assurance Cup. Middlesex emerged as victors, defeating Derbyshire in the final.