Gareth Wyn Williams, Baron Williams of Mostyn, PC, QC (5 February 1941 – 20 September 2003), was a Welsh barrister and Labour politician who was Leader of the House of Lords, Lord President of the Council and a member of the Cabinet from 2001 until his sudden death in 2003.

[1] He was created a life peer on 20 July 1992 as Baron Williams of Mostyn, of Great Tew in the County of Oxfordshire,[3] and became an opposition spokesman in the House of Lords on Legal Affairs, and later Northern Ireland.

After Labour's election victory he was appointed a Home Office minister, and in 1999 became Attorney General for England and Wales and Northern Ireland.

[4] In his book A View from the Foothills Chris Mullin wrote that he thought that Gareth Williams was most likely to succeed Derry Irvine as Lord Chancellor; in the event the position was next filled by Charles Falconer.

[1] He died from a heart attack at his home in Evenlode, Gloucestershire on 20 September 2003, aged 62, and was buried at St Michael and all Angels Church in Great Tew, Oxfordshire.