Black Watch/Government then Campbell of Cawdor

The Argyll and Sutherland Highlanders (Princess Louise's) was a line infantry regiment of the British Army that existed from 1881 until amalgamation into the Royal Regiment of Scotland on 28 March 2006.

The regiment was created under the Childers Reforms in 1881, as the Princess Louise's (Sutherland and Argyll Highlanders), by the amalgamation of the 91st (Argyllshire Highlanders) Regiment of Foot and 93rd (Sutherland Highlanders) Regiment of Foot, amended the following year to reverse the order of the "Argyll" and "Sutherland" sub-titles. The Argyll and Sutherland Highlanders was expanded to fifteen battalions during the First World War (1914–1918) and nine during the Second World War (1939–1945). The 1st Battalion served in the 1st Commonwealth Division in the Korean War and gained a high public profile for its role in Aden during 1967.

During the Crimean War, the 93rd earned the sobriquet of "The Fighting Highlanders" and carried with it the status of having been the original "Thin Red Line". This title was bestowed following the action of the 93rd at Balaklava on 25 October 1854 in which this single battalion alone stood between the undefended British Army base at Balaklava and four squadrons of charging Russian cavalry. The 93rd, under the command of Sir Colin Campbell, not only held steady, but for the first time in the history of the British Army, broke a large cavalry charge using musket fire alone, without having been formed into a square.

The regiment counts no less than 16 recipients of the Victoria Cross.