The Corps of Royal Marines is the United Kingdom's amphibious light infantry force, forming part of the Naval Service, along with the Royal Navy. The Royal Marines were formed in 1755 as the Royal Navy's infantry troops.

However, the marines can trace their origins back to the formation of the English Army's "Duke of York and Albany's maritime regiment of Foot" at the grounds of the Honourable Artillery Company on 28 October 1664.

As a highly specialised and adaptable light infantry force, the Royal Marines are trained for rapid deployment worldwide and capable of dealing with a wide range of threats.

The Corps operates in all environments and climates, though particular expertise and training is spent on amphibious warfare, arctic warfare, mountain warfare, expeditionary warfare, and its commitment to the UK's Rapid Reaction Force.