| All-Ireland Senior B Hurling Championship | |
| Year: | 2003 |
| Country: | |
| Champions: | Wicklow |
| Runner-Up: | Roscommon |
| Prevseason: | 2002 |
| Nextseason: | 2004 |
The 2003 All-Ireland Senior B Hurling Championship was the 25th staging of Ireland's secondary hurling knock-out competition. Wicklow won the championship, beating Roscommon 4–16 to 2–13 in the final at Croke Park, Dublin.