The Royal Scots Borderers is an infantry battalion of the Royal Regiment of Scotland. Two infantry regiments ; the Royal Scots and the King's Own Scottish Borderers merged on the 28 March 2006, and with the other Scottish infantry regiments amalgamated into the single seven battalion strong Royal Regiment of Scotland.

The Royal Regiment of Scotland is unique in the British Army in that the names of the regiments that were amalgamated to form it have been retained, with their battalion numbers used as subtitles. Two of the initial six regular battalions, the Royal Scots Battalion and King's Own Scottish Borderers Battalion were amalgamated in August 2006 – upon their amalgamation, the new battalion took the name Royal Scots Borderers, 1st Battalion Royal Regiment of Scotland.

The battalion wears a flat black hackle behind the Royal Regiment of Scotland cap badge on the TOS (Tam O' Shanter) to distinguish itself as the Royal Scots Borderers.