| Thomas O'Mahony | |
| Office: | Teachta Dála |
| Term Start: | August 1923 |
| Term End: | 20 July 1924 |
| Constituency: | Cork East |
| Birth Place: | County Cork, Ireland |
| Death Date: | 20 July 1924 |
| Death Place: | County Cork, Ireland |
| Nationality: | Irish |
| Party: | Cumann na nGaedheal |
Thomas O'Mahony (died 20 July 1924) was an Irish Cumann na nGaedheal politician who sat as a Teachta Dála (TD) in Dáil Éireann in the 1920s.[1]
At the 1923 general election, he was elected for the Cork East constituency to the 4th Dáil.[2] He died less than a year later, on 20 July 1924. The by-election for his Dáil seat was held on 18 November 1924, and won by the Cumann na nGaedheal candidate Michael K. Noonan.[3]