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