Crundmáel Erbuilc mac Rónáin (died 656) was a King of Leinster from the Uí Cheinnselaig branch of the Laigin.
[2] Crundmáel Erbuilc became king of the Ui Chennselaig in 647 on the death of Colgu Bolg Luatha mac Crundmail.
[3] The Book of Leinster gives Faelan a reign of 30 years and his death obit of 666 in the annals appears to be an interpolation based on the king lists.
[4] It is more probable that he died before 656 when Crundmáel Erbuilc mac Rónáin is called king of Leinster at his death obit.
By his wife Faílend ingen Suibne of the Déisi Muman he had a daughter Eithne who married Failbe mac Domnaill of the Uí Bairrche.