The Under-Secretary of State for Commonwealth Relations was a junior ministerial post in the United Kingdom Government from 1947 until 1966. The holder was responsible for assisting the Secretary of State for Commonwealth Relations in dealing with British relationship with members of the Commonwealth of Nations (its former colonies). The position was created out of the old position of Under-Secretary of State for Dominion Affairs.

After 1966 the post was merged with the Under-Secretary of State for the Colonies and became the Under-Secretary of State for Commonwealth Affairs.

Officeholders 1947: Arthur Bottomley 1947: Patrick Gordon Walker 1950: Angus Holden, 3rd Baron Holden 1950: David Rees Williams 1951: George Bingham, 6th Earl of Lucan 1951: John Foster 1954: Douglas Dodds-Parker 1955: Allan Noble 1956: Lord John Hope 1957: Cuthbert Alport 1959: Richard Thompson 1960: Andrew Cavendish, 11th Duke of Devonshire (to 1962) 1961: Bernard Braine (to 1962) 1962: John Tilney (to 1964) 1964: Stephen Taylor, Baron Taylor, also Under-Secretary of State for the Colonies 1965: Frank Beswick, Baron Beswick, also Under-Secretary of State for the Colonies until 1 August 1966