The Royal Scots (The Royal Regiment), once known as the Royal Regiment of Foot, was the oldest, and therefore most senior, infantry regiment of the line in the British Army, having been raised in 1633 during the reign of Charles I of Scotland. The regiment existed until 2006, when it amalgamated with the King's Own Scottish Borderers to become the Royal Scots Borderers, 1st Battalion of the newly formed Royal Regiment of Scotland

On 28 March 2006, the Royal Scots ceased to exist as an independent regiment, being joined with the five other regular regiments of the Scottish Division to form The Royal Regiment of Scotland. The Royal Scots were designated simply as The Royal Scots Battalion, The Royal Regiment of Scotland, with no number; it is notable that the battalions of the Royal Regiment of Scotland were unique among the new large regiments in retaining their regimental titles for the new battalions. In August of that year, as planned, the Scottish Division was reduced from six battalions to five by amalgamation, with the Royal Scots Battalion being amalgamated with the King's Own Scottish Borderers Battalion to form The Royal Scots Borderers, 1st Battalion The Royal Regiment of Scotland.