| Office: | Senator |
| Term Start: | 24 February 1970 |
| Term End: | 24 January 1974 |
| Constituency: | Agricultural Panel |
| Birth Place: | County Cork, Ireland |
| Death Place: | County Cork, Ireland |
| Party: | Fianna Fáil |
Cornelius Kevin O'Callaghan (1922 – 24 January 1974) was an Irish Fianna Fáil politician.[1] He stood for election to Dáil Éireann as a Fianna Fáil candidate for the Cork North constituency at the 1951 general election but was unsuccessful.[2]
He was elected to Seanad Éireann to the Agricultural Panel at a by-election on 24 February 1970. He was re-elected at the 1973 Seanad election. He died in 1974 during the 13th Seanad.[1]