The Kings of Uí Cheinnselaig were a branch of the Laigin who came to dominate southern Leinster, known also as Laigin Desgabair. They were semi-independent of their overlords in the north of Leinster and sometimes provided rulers of all Leinster.
The following list is a partial list of kings of the Uí Cheinnselaig compiled from the king list in the Book of Leinster and records kept in the Annals of Ulster.