James Vernon the Younger (15 June 1677 – 17 April 1756) was a British diplomat and civil servant, briefly a Member of Parliament
He was the son of James Vernon, who was Secretary of State under William III.
He served as British envoy to Denmark from 1702 to 1707 and then as Member of Parliament for Cricklade from 1708 to 1710. However, most of his career was as a civil servant. He was an extra clerk of the Her Majesty's Most Honourable Privy Council from 1697, becoming one of the Clerk of the Privy Council in 1715, a post he held for the rest of his life.
He was elected a Fellow of the Royal Society in May 1702