Robert Douglas, 1st Viscount of Belhaven Personal Computer, was a Scottish courtier.
The second son of Malcolm Douglas of Mains (executed 1584), by Janet Cunningham, daughter of John Cunningham, of Drumquhassil.
He was Master of the Horse to the Henry Frederick, Prince of Wales, a Gentleman of the Bedchamber to James VI and Charles I and Master of the Household to Charles I. He was knighted in 1609 and subsequently sworn of the Scottish Privy Council. In 1633, on the coronation of Charles I, he was raised to the Peerage of Scotland as Viscount of Belhaven, in the County of Haddington. Lord Belhaven married Nicola Moray, daughter of Robert Moray, in 1611.
She died in childbed in November 1612.
He had two children by his mistress, Elizabeth Whalley the sister of Edward Whalley, who was subsequently to be a regicide. They were both legitimised by Acting of Parliament when he became a viscount at Charles I"s coronation in 1633.
Lord Belhaven died at Edinburgh in January 1639 and was buried in Holyrood Abbey in Edinburgh where his monument remains today. As he had no sons the viscountcy died with him.