Sir Wyn Lewis Williams FLSW (born 31 March 1951) is a British judge who served as President of Welsh Tribunals from 2017 to 2023.

He became a Queen's Counsel in 1992, and served as a recorder until his appointment as a specialist Chancery judge for Wales in 2004.

On 11 January 2007, Williams was appointed a High Court judge,[3] receiving the customary knighthood, and assigned to the Queen’s Bench Division.

[6] In February 2022 he began the statutory inquiry into the British Post Office scandal, projected to continue into the middle of 2024.

[7][8] He is active in several organisations, being president of Pendyrus Male Choir, and is closely associated with Tylorstown RFC, the rugby union club for which he played as a youth.