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.