| Country | Ireland England |
||
|---|---|---|---|
| Champions | Westmeath | ||
| Runner-up | London | ||
|
|||
The All-Ireland Senior B Hurling Championship of 1984 was the 11th staging of Ireland's secondary hurling knock-out competition. Westmeath won the centenary year championship, beating London 4-10 to 1-16 in the final at the Emerald GAA Grounds, Ruislip.