The British Royal Family is the group of close relatives of the Monarch of the United Kingdom.

The term is also commonly applied to the same group of people as the relations of the monarch in his or her role as sovereign of any of the other Commonwealth realms, thus sometimes at variance with official national terms for the family.

Members of the royal family belong to, or are married into, the House of Windsor, since 1917, when George V changed the name of the royal house from Saxe-Coburg and Gotha. There is no strict legal or formal definition of who is or is not a member of the Royal Family.