The 2018 Offaly Senior B Hurling Championship was the first staging of the Offaly Senior B Hurling Championship since its establishment by the Offaly County Board. The championship ran from 1 April to 6 October 2018.
The final was played on 6 October 2018 at Bord na Móna O'Connor Park in Tullamore, between Ballinamere and Shamrocks, in what was their first ever meeting in the final. Ballinamere won the match by 2âÂÂ16 to 3âÂÂ10 to claim their first ever championship title.
Relegated from the Offaly Senior Hurling Championship
Promoted from the Offaly Intermediate Hurling Championship