Tomás Ó Cellaigh was a Catholic Bishop of Clonfert. His death is recorded as 6 January 1263. O Cellaigh was elected to that position sometime prior to 7 November 1259, as he received possession of temporalities commencing on that date.

His name is also recorded as Tomás mac Domnaill Móir Ó Cellaig. He was probably from Ui Maine.

References

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Preceded by Bishops of Clonfert
before 1259-1263
Succeeded by
Johannes de Alatre