Sir Guildhaume Myrddin-Evans CB KCMG (17 December 1894 – 15 February 1964) was a Welsh senior civil servant and labour expert.

[1] He joined the South Wales Borderers on the outbreak of the First World War and served as a lieutenant in France and Flanders.

In 1917 he was badly injured and joined David Lloyd George's personal secretariat before being appointed as assistant secretary to the War Cabinet in 1919.

He worked at the Treasury between 1920 and 1929 before moving to the Ministry of Labour where he became deputy chief insurance officer in 1935.

[3] In 1941 he was appointed as head of the Production Executive Secretariat in the Cabinet Office and in 1942 served as a labour consultant to the governments of Canada and the United States.