The 1990 All-Ireland Senior B Hurling Championship was the 17th staging of the All-Ireland Senior B Hurling Championship since its establishment by the Gaelic Athletic Association in 1974. The championship ran from 27 May to 8 July 1990.
Kildare entered the championship as the defending champions.
The All-Ireland final was played at Emerald GAA Grounds in Ruislip on 8 July 1990 between London and Kildare, in what was their third meeting in the All-Ireland final and a second meeting in succession. London won the match by 1-15 to 5-02 to claim their third All-Ireland title overall and a first title in two years.
Kildare's Mick Moore was the championship's top scorer with 8-05.