Floors Castle, in Roxburghshire, south-east Scotland, is the seat of the Duke of Roxburghe. Despite its name it is an estate house rather than a fortress. It was built in the 1720s by the architect William Adam for Duke John, possibly incorporating an earlier tower house. In the 19th century it was embellished with turrets and battlements, designed by William Playfair, for The 6th Duke of Roxburghe. Floors has the common 18th-century layout of a main block with two symmetrical service wings. Floors Castle stands by the bank of the River Tweed and overlooks the Cheviot Hills to the south.

The Duke of Roxburghe is a title in the peerage of Scotland created in 1707 along with the titles Marquess of Bowmont and Cessford, Earl of Kelso and Viscount Broxmouth. John Ker, 5th Earl of Roxburghe became the first holder of these titles. The title is derived from the royal burgh of Roxburgh in the Scottish Borders that in 1460 the Scots captured and destroyed.