The King's Own Scottish Borderers is an infantry regiment of the British Army. It was raised in 1689 by the Earl of Leven , and was ranked as the 25th Foot in 1751. The 25th was the county regiment of Sussex from 1782 to 1805, before its recruiting area was moved to the Scottish Borders region. From then it was known as the King's Own Borderers, becoming the King's Own Scottish Borderers in 1887. As of 2004 the regiment is one of five in the line infantry never to have been amalgamated, the others being:

• The Royal Scots
• The Green Howards
• The 22nd (Cheshire) Regiment
• The Royal Welch Fusiliers

Restructuring of the Infantry

In 2004, as part of the British Government's defence review, it was announced that Scotland would lose an infantry battalion. It is believed that this will be achieved through the amalgamation of the King's Own Scottish Borderers with the Royal Scots. This single battalion will form part of the new Royal Regiment of Scotland.