| All-Ireland Senior B Hurling Championship | |
| Year: | 1978 |
| Country: | |
| Winners: | Antrim |
| Second: | London |
| Prev Season: | 1977 |
| Next Season: | 1979 |
The 1978 All-Ireland Senior B Hurling Championship was the fifth staging of Ireland's secondary hurling knock-out competition. Antrim won the championship, beating London 1–16 to 3–7 in the final at Croke Park, Dublin.
Home final: (1 match) The winners of the two semi-finals contest this game. One team is eliminated at this stage while the winners advance to the 'proper' All-Ireland final.
Final: (1 match) The winners of the All-Ireland 'home' final join London to contest this game. One team is eliminated at this stage while the winners are allowed to participate in the All-Ireland SHC quarter-final.