The 2001–02 Celtic League was the inaugural season of the Celtic League. The first season would see fifteen teams compete: the four Irish provinces: Connacht, Leinster, Munster and Ulster; two Scottish teams: Edinburgh Reivers and Glasgow; and all nine Welsh Premier Division teams: Bridgend, Caerphilly, Cardiff, Ebbw Vale, Llanelli, Neath, Newport, Pontypridd and Swansea.