The British Army is the land armed forces branch of the British Armed Forces. It came into being with unification of the Kingdoms of England and Scotland into the United Kingdom of Great Britain in 1707. The new British Army incorporated Regiments that had already existed in England and Scotland and was administered by the War Office from London. Since 1963 it has been managed by the Ministry of Defence.

As of April 2007, the British Army includes roughly 101,310 regular personnel and 38,460 Territorial Army members. The full-time element of the British Army has also been referred to as the Regular Army since the creation of the reservist Territorial Army in 1908. The British Army is deployed in many of the world's war zones as part of both Expeditionary Forces and in United Nations Peacekeeping forces. The British Army is currently deployed to Kosovo, Cyprus, Germany, Iraq, Afghanistan and many other places.

In contrast to the Royal Navy, Royal Marines and Royal Air Force, the British Army does not include "Royal" in its title, however many of its constituent Regiments and Corps are styled Royal.