Kraljevske oružane snage (Her Majesty's Armed Forces), uobičajeno nazivane Britanske oružane snage (British Armed Forces ili Armed Forces of the Crown) su vojska Ujedinjenog Kraljevstva. Oružane snage se sastoje od tri uniformirane službe, Kraljevske mornarice (Royal navy) i Kraljevskog marinskog korpusa (Royal Marine Corps) koji čine Mornaričku službu (Naval Service), Kopnene vojske (British Army) te Kraljevskih zračnih snaga (Royal Air Force). Komandant Kraljevskih oružanih snaga je Britanski monarh, Kraljica Elizabeta II kojoj zakletvu polažu svi pripadnici Oružanih snaga. Po britanskom Ustavu, oružane snage su podređene Kruni, ali njima rukovodi Vijeće odbrane (Defence Council)  Ministarstva odbrane kojim rukovodi Državni sekretar za odbranu (Secretary of State for Defence).

      Britanske oružane snage su profesionalna vojska, koja je krajem 2013. godine brojala 205.850 vojnika. Uz njih, tu je i 181.720 pripadnika redovne rezerve iz svih službi Britanskih oružanih snaga. Ove snage predstavljaju drugu po veličini profesionalnu vojsku u Evropskoj uniji. Ministarstvo odbrane kao dio Vlade je zaduženo za formuliranje i provođenje odbrambene politike Oružanih snaga. U ministarstvu radi preko 80.000 civilnih lica, ali će do 2015. njihov broj biti smanjen na 55.000.

      Her Majesty's Armed Forces, commonly known as the British Armed Forces, and occasionally the Armed Forces of the Crown, are the armed forces of the United Kingdom. The Armed Forces consists of three professional uniformed services: the Royal navy and Royal Marine Corps, forming the Naval Service, the British Army and the Royal Air Force. The Commander-in-Chief of Her Majesty's Armed Forces is the British monarch, Queen Elizabeth II, to whom members of the forces swear allegiance. Under British constitutional law, the armed forces are subordinate to the Crown. The armed forces are managed by the Defence Council of the Ministry of Defence, headed by the Secretary of State for Defence.

      The British Armed Forces is a professional force with a strength in October 2013 of 205,850 Service Personnel. In addition, there were 181,720 Regular Reserves from all services of the British Armed Forces. The British Armed Forces constitute the second-largest military in the European Union in terms of professional personnel. The Ministry of Defence is the Government department and highest level of military headquarters charged with formulating and executing defence policy for the Armed Forces; it currently employs over 80,000 civilians in 2011. This number will be reduced to just 55,000 by 2015.