| Tournament details | |
|---|---|
| Country |  Ireland England |
| Final positions | |
| Champions | Antrim |
| Runner-up | London |
The 1981 All-Ireland Senior B Hurling Championship was the eighth staging of Ireland's secondary hurling knock-out competition. Antrim won the championship, beating London 3–17 to 3–14 in the final at Fr. Healy Park, Loughguile.