1993-94 was the fourth season of the All-Ireland League, Ireland's top rugby union club competition. In 1993-94 the league expanded to 46 teams in four divisions - 11 in Divisions 1, 2 and 4, and 13 in Division 3. Two teams were relegated from Divisions 1 and 2, and three from Division 3. Division 4 club Westport withdrew from the league at the end of the season, leaving 45 teams in four divisions for 1994-95, with Division 3 reduced to 12 teams. Garryowen were champions for the second time.