| Patrick McMahon | |
| Office: | Member of Parliament for New Ross |
| Term Start: | 18 November 1868 |
| Term End: | 9 February 1874 |
| Predecessor: | Charles George Tottenham |
| Successor: | John Dunbar |
| Office2: | Member of Parliament for County Wexford |
| Term Start2: | 26 July 1852 |
| Term End2: | 24 July 1865 |
| Predecessor2: | James Fagan Hamilton Knox Grogan Morgan |
| Alongside2: | John George (1859–1865) John Hatchell (1857–1859) John George (1852–1857) |
| Successor2: | John George James Power |
| Birth Date: | 1813 |
| Nationality: | Irish |
| Party: | Liberal |
| Otherparty: | Ind. Irish (1852–1859) Radical (until 1852) |
Patrick McMahon (1813 – 19 December 1875) was an Irish Liberal, Independent Irish Party, and Radical politician.
McMahon was first elected as one of the two Members of Parliament (MPs) for County Wexford as a Radical[1] at the 1852 general election but shortly after joined the Independent Irish Party when it formed later that year. He held the seat until 1865, being re-elected as an Independent Irish Party candidate in 1857, and then as a Liberal Party candidate, upon its creation, in 1859.
He was later elected MP as a Liberal candidate for New Ross in the 1868 general election and held the seat until 1874 when he stood down.[2]