The 1991 All-Ireland Senior B Hurling Championship was the 18th staging of the All-Ireland Senior B Hurling Championship since its establishment by the Gaelic Athletic Association in 1974. The championship ran from 12 May to 7 July 1991. London entered the championship as the defending champions. The All-Ireland final was played at Cusack Park in Mullingar on 7 July 1991 between Westmeath and London, in what was their third meeting in the All-Ireland final and a first meeting in seven years. Westmeath won the match by 2-12 to 2-06 to claim their third All-Ireland title overall. Westmeath's David Kilcoyne was the championship's top scorer with 2-19.

Results

All-Ireland preliminary round

All-Ireland quarter-finals

All-Ireland semi-finals

All-Ireland home final

All-Ireland final

Championship statistics

Top scorers