The Black Watch, 3rd Battalion, Royal Regiment of Scotland (3 SCOTS) is an infantry battalion of the Royal Regiment of Scotland.
Prior to 28 March 2006, the Black Watch was an infantry regiment in its own right; The Black Watch (Royal Highland Regiment) from 1931 to 2006, and The Royal Highland Regiment (The Black Watch) from 1881 to 1931. Part of the Scottish Division, it was the senior regiment of Highlanders.
The regiment's name allegedly came from the dark tartan that they wore and from its role to "watch" the Highlands. "Black Watch" was originally a nickname for the 42nd (Royal Highland) Regiment of Foot, but was used more and more so that, in 1881, when the 42nd amalgamated with the 73rd Regiment of Foot, the new regiment was named "The Royal Highland Regiment (The Black Watch)", with The Black Watch becoming the regiment's official designation in 1931. The uniform changed over time, but the nickname has been more enduring. The regimental motto was Nemo me impune lacessit (no man provokes me with impunity).
The Royal Stewart Tartan is worn by the battalion's Pipes and Drums due the royal designation. Six independent companies were first formed from 1725 to stop fighting among the clans.