John Drummond, 1st Earl (and titular 1st Duke) of Melfort KG KT PC (1649–1714) was a Scottish politician.
He joined the army and was captain of the Scottish Footguards in 1673. He secured the post of deputy governor of Edinburgh Castle in 1679, followed by Lieutenant-General and Master of the Ordnance in 1680. He served as Secretary of State in Scotland under James II and VII from 1684 until 1688, and with his brother James Drummond, 4th Earl of Perth, the Lord Chancellor, practically ruled Scotland until James's abdication. He converted to Roman Catholicism. After the landing of the Prince of Orange, he advocated a wholesale seizure of influential Whigs.
He was created Viscount of Melfort and Lord Drummond of Gillestoun in 1685, and a member of the Privy Council of England in the same year, and Earl of Melfort, Viscount of Forth and Lord Drummond of Riccartoun, Castlemains and Gilstoun in 1686, all titles in the Peerage of Scotland. In 1687, he was appointed one of the founder Knights of the Order of the Thistle. He was further created Baron Cleworth in the Peerage of England on 7 August 1689.
He escaped to France on 16 December 1688, and attended the exiled monarch as Secretary of State for a time in Ireland. However, he was in conflict over policy with the Duke of Tyrconnell and the French ambassador the Comte d'Avaux; this led to his return to France, reaching St Germain in October 1689. The queen, Mary of Modena, then sent him as James's ambassador to Rome. At Rome, he enjoyed considerable social success, but none politically for Pope Alexander VIII had adopted an anti-French position in the Nine Years' War. He remained in Rome until after the election of Pope Innocent XII, but the new pope was no more willing to aid James to regain his crowns than his predecessor. Accordingly, Melfort was recalled to St Germains, where he became James's Secretary of State until June 1694, though the Earl of Middleton became joint Secretary with him on his arrival from England in spring 1693.