| William Fagan | |
| Office: | Member of Parliament for Carlow |
| Term Start: | 20 November 1868 |
| Term End: | 3 February 1874 |
| Predecessor: | Thomas Stock |
| Successor: | Henry Owen Lewis |
| Birth Date: | 15 December 1832 |
| Nationality: | Irish |
| Party: | Liberal |
| Parents: | William Trant Fagan Mary Addis |
William Addis Fagan (15 December 1832 – 14 March 1890) was an Irish Liberal politician.[1]
He was elected as the Member of Parliament (MP) for Carlow at the 1868 general election but stood down at the next general election, in 1874.[2]
At some point, Fagan was also Captain of the 12th Royal Lancers.[1]
Fagan was the son of Cork City MP William Trant Fagan. In 1832, he married Frances Mahony, daughter of Daniel Mahony, and together they had two children: Maureen Elizabeth Fagan (born 1875), and William Charles Trant Fagan (born 1877).[1]