Cairell mac Muiredaig Muinderg (died 532) also Cairell Coscrach ("victorious") was a king of Ulaid from the Dal Fiatach. He was the son of Muiredach Muinderg mac Forggo (died 489) and brother of Eochaid mac Muiredaig Muinderg (died 509), previous kings.
In the period following the destruction of Emain Macha after 450, Ulidia underwent a recuperation in which the Dal Fiatach emerge as the overlords with his father Muiredach as the first historical king. In 496/498 the annals record the storming of Dún Lethglaise (Downpatrick, modern County Down) which may be connected with the rise of Dal Fiatach in this area which was to become their power base.
The Tripartite Life of St. Patrick has a story that Saint Patrick cursed the descendants of his brother Eochaid and gave his blessing to the descendants of Cairell. Cairell's descendants did monopolize the kingship. His known sons were Demmán mac Cairill (died 572) and Báetán mac Cairill (died 581), both kings of Ulaid.
- Byrne, Table 6; Charles-Edwards, Appendix XXI; Mac Niocaill, pg.74
- Annals of Tigernach, AT 509.3, 532.3
- the king list in the Book of Leinster gives him a reign of 25 years and the Laud Synchronisms 23 years.
- Mac Niocaill, pg.73
- Ó Cróinín, pg.214
- The Most Ancient Lives of Saint Patrick edited by James O'Leary
- Annals of Ulster at  at University College Cork
- Annals of Tigernach at  at University College Cork
- Byrne, Francis John (2001), Irish Kings and High-Kings, Dublin: Four Courts Press, ISBN 978-1-85182-196-9
- Charles-Edwards, T. M. (2000), Early Christian Ireland, Cambridge: Cambridge University Press, ISBN 0-521-36395-0
- Dáibhí Ó Cróinín (2005), A New History of Ireland, Volume One, Oxford: Oxford University Press
- Gearoid Mac Niocaill (1972), Ireland before the Vikings, Dublin: Gill and Macmillan
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