| Frederick Williamson | |
| Full Name: | Frederick William Williamson |
| Birth Date: | 25 January 1905 |
| Birth Place: | Wexford, Ireland |
| Death Place: | Richmond, England |
| Position: | Centre/ Fullback |
| Repyears1: | 1930 |
| Repcaps1: | 3 |
| Reppoints1: | 0 |
Frederick William Williamson (25 January 1905 — 13 May 1995) was an Irish international rugby union player.
Although primarily a centre three-quarter, Williamson was called upon by Ireland in 1930 to succeed Joe Stewart at fullback and gained three caps.[1] He was the first Ireland back to be selected from Dolphin RFC.[2]
Williamson later played rugby for Wanderers in Dublin.[3]