| Sport | Rugby union |
|---|---|
| Instituted | 2003 |
| Inaugural season | 2003–04 |
| Ceased | 2004–05 |
| Number of teams | 12 (2003–04), 8 (2004–05) |
| Nations |  Ireland Scotland Wales |
| Holders | Munster (2004–05) |
| Most titles | Munster Ulster (1 title) |
| Broadcast partner | BBC |
| Related competition | Celtic League |
The Celtic Cup was a rugby union cup competition featuring regional and provincial teams from Ireland, Scotland and Wales that ran for two seasons between 2003 and 2005. The first edition of the competition was won by Ulster and the second by Munster, both from Ireland. After the Welsh teams agreed to join the English Premiership clubs to form the Anglo-Welsh Cup for the 2005–06 season, the Celtic Cup was discontinued. A separate competition under the same name was inaugurated in 2018 for Welsh and Irish development sides.