William Williams (4 January 1875 - 13 January 1968), better known by his bardic name of "Crwys", was a Welsh poet in the Welsh language. He served as Archdruid of the National Eisteddfod of Wales from 1939 to 1947.
Like all other Archdruids, Crwys had himself won several major prizes at the National Eisteddfod. In his case, he was a three-time winner of the crown: at Colwyn Bay in 1910, at Carmarthen in 1911, and at Corwen in 1919. A cast bronze bust in honour of the poet is on display at Carmarthen castle.
| Preceded by John James Williams (poet) |
Archdruid of the National Eisteddfod of Wales 1939-1947 |
Succeeded by William Evans (Wil Ifan) |