Cairbre Crom ("Cairbre the Hunched"; fl. c. AD 556) was an Irish king of the 6th century AD; he was 11th King of Uí Maine, in the west of Ireland.
Cairbre Crom is regarded as the last of the semi-historical kings of Uí Maine, his floruit estimated to be the second quarter of the 6th century.
He was a descendant of Máine Mór, who founded the kingdom of Uí Maine about the middle years of the 4th-century. In the king-lists, he is recorded as the 10th (inclusive) in succession to Máine Mór.
Cairbre is listed, along with Cairpri Mac Feithine and Nadsluaigh as the three sons of Feradhach mac Lughaidh. His pedigree is given thus:
Cairbre's notability is as the ancestor of almost all subsequent rulers of both Uí Maine and Síol Anmchadha, from the early historic period into the early modern era, a period of over one thousand years.
Cairbre Crom's descendant Anmchadh mac Eogan Buac (died c. 757), founded the kingdom of Síol Anmchadha, which was referred to as Irish: deiscert O Maine (southern Uí Maine). Families descended from Cairbre via Anmchadh include hUallacháin and Madden.
Eoghan Finn was the ancestor of King Tadhg Mór Ua Cellaigh (died 1014), from whom descend the Clann Ó Cellaigh or Kelly of County Galway, who were referred to as Irish: tuaiscert O Maine (northern Uí Maine).
The two Eoghan's shared the same name because they likely had different mothers, hence the use of epithets. They were sons of Cormac mac Cairbre Crom.