The Celtic League was founded in 2001, featuring rugby union clubs from Scotland, Wales and All-Ireland.
Magners became title sponsors of the Celtic League in 2006. In 2010-11 Italian teams joined for the first time.
| Current clubs:|
Benetton Treviso | Cardiff Blues | Connacht | Edinburgh | Glasgow Warriors | Leinster | Munster | Newport Gwent Dragons | Ospreys | Scarlets | Ulster | Zebre