Uí Bairrche (Modern Irish: Uí Bhairrche, IPA:[ˈiːˈwaːɾʲɾʲçə]) was an Irish kin-based group that originally held lands in the south of the ancient province of Leinster (or Cóiced Laigen "the Fifth of the Laigin"). Another south Leinster kin group associated with the Uí Bairrche were groups of the Fothairt. The south of Leinster was dominated by the Uí Chennselaig in the 8th century. Uí Bairrche held lands around Carlow, however Uí Chennselaig expansion split the kindred. The result was that one Uí Bairrche branch persevered in the Barrow valley; and another was forced to move south towards the Wexford coast.
