Crundmáel mac Suibni (died c. 660) was a King of Ailech and head of the Cenél nEógain branch of the northern Uí Néill.
He was the son of the high king of Ireland Suibne Menn (died 628).
[1] According to the Laud Synchronisms he succeeded his uncle Ernaine mac Fiachnai (died 636) and ruled for 24 years which gives a possible reign of 636-660 as King of Ailech.
[3] The only event recorded of his reign is the Battle of Flescaig, where he defeated Cumascach, son of Ailill, chief of Uí Cremhthainn of the Airgíalla in 656 who was slain.
[4] His son Ferg mac Crundmaíl (died c. 670) was also a King of Ailech.