The Queen's Guard and Queen's Life Guard (called King's Guard and King's Life Guard when the reigning monarch is male) are the names given to contingents of infantry and cavalry soldiers charged with guarding the official royal residences in the United Kingdom. The British Army has regiments of both Horse Guards and Foot Guards predating the English Restoration (1660), and since the reign of King Charles II these regiments have been responsible for guarding the Sovereign's palaces. They are not purely ceremonial, despite tourist perceptions to the contrary.

The Queen's Guard are fully operational soldiers.