| Office: | Senator |
| Term Start: | 8 September 1943 |
| Term End: | 27 December 1959 |
| Constituency: | Dublin University |
| Birth Date: | 14 October 1892 |
| Birth Place: | Dublin, Ireland |
| Death Place: | Dublin, Ireland |
| Party: | Independent |
| Education: | St Andrew's College, Dublin |
William Robert Fearon (14 October 1892 – 27 December 1959) was an Irish politician and academic. He was an independent member of Seanad Éireann from 1943 to 1959.[1]
He was educated at St Andrew's College, Dublin and Trinity College Dublin. He received a BA in natural science in 1915, and then entered medical school, although it was several years before he took his medical degree.[1] He was a Mackinnon research student of the Royal Society from 1919 to 1921, studying biochemistry at Emmanuel College, Cambridge.[1]
He was first elected to the Seanad in 1943 for the Dublin University constituency.[2] He was re-elected at the 1944, 1948, 1951, 1954 and 1957 elections.[2] He died while still in office, and William J. E. Jessop won the subsequent by-election.
He was Professor of Biochemistry at Trinity College Dublin.[3] In 1937, he wrote a play called Parnell of Avondale.[1]
He died on 27 December 1959, aged 67, at Monkstown Hospital, Dublin; he never married.[1]