The 26th (Cameronian) Regiment of Foot was an infantry regiment of the Scots Army and subsequently a Scottish infantry regiment of the British Army, active from 1689 to 1881. Although the regiment took the name of its first colonel as The Earl of Angus's Regiment, it became popularly known as The Cameronians until 1751, when it was ranked as the 26th Foot. Under the Childers Reforms it amalgamated with the 90th Regiment of Foot to form the Cameronians in 1881. The Cameronians were themselves disbanded in 1968, meaning that no Army unit today perpetuates the lineage of the 26th Foot.

The Scots Army was the army of the Kingdom of Scotland between the Restoration in 1660 and the Acts of Union of 1707. A small standing army was established at the Restoration, which was mainly engaged in opposing Covenanter rebellions and guerrilla warfare pursued by the Cameronians in the East. There were also attempts to found a larger militia. By the Glorious Revolution in 1688–89 the standing army was over 3,500 men. Several new regiments were raised to defend the new regime and, although some were soon disbanded several took part in William II's continental wars. By the time of the Act of Union in 1707, the army had seven units of infantry, two of horse and one troop of Horse Guards. Early units wore grey, but adopted red like the English army after 1684. New Scottish and particularly Highland regiments would be raised from the 1740s, some of which had a long history within the army.