| All-Ireland Senior B Hurling Championship | |
| Year: | 2004 |
| Country: | |
| Champions: | Kildare |
| Runner-Up: | Mayo |
| Prevseason: | 2003 |
The 2004 All-Ireland Senior B Hurling Championship was the 26th staging of the All-Ireland Senior B Hurling Championship, Ireland's secondary hurling knock-out competition. Kildare won the championship, beating Mayo 3-14 to 3-7 in the final at Croke Park, Dublin.
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