| Office: | Teachta Dála |
| Term Start: | July 1959 |
| Term End: | June 1969 |
| Constituency: | Clare |
| Birth Date: | 17 April 1896 |
| Birth Place: | County Clare, Ireland |
| Death Place: | County Clare, Ireland |
| Party: | Fianna Fáil |
Seán Ó Ceallaigh (17 April 1896 – 15 June 1994) was an Irish Fianna Fáil politician.[1] He was first elected as a Fianna Fáil Teachta Dála (TD) for the Clare constituency at a by-election on 22 July 1959, succeeding Éamon de Valera who had been elected President of Ireland. He was re-elected at the 1961 general election and at the 1965 general election.[2] He did not contest the 1969 general election.
Ó Ceallaigh taught in the all-Irish Coláiste Uí Chomhraidhe, Carrigaholt, County Clare. His son, Fiachra Ó Ceallaigh, was an Auxiliary Bishop of Dublin.