Sir Albertus Morton (c. 1584 – 20 November 1625) was an English diplomat and politician who served as a Secretary of State for a brief period in 1625.
Born around 1584, Morton was the son of George Morton of Esture and his wife Elizabeth, sister of Sir Henry Wotton. He was educated at Eton College and King's College, Cambridge, where he matriculated in 1602. He subsequently studied law at Gray's Inn.
Morton began his career in public service as a secretary to his uncle, Sir Henry Wotton, during Wotton's ambassadorship to Venice. He served in various diplomatic capacities, including as an agent in Savoy (1614) and later as an ambassador to the Holy Roman Empire (1621-1622). In 1622, he was knighted.
He was elected as a Member of Parliament for the constituency of Dunwich in 1621 and for Kent in 1625. In February 1625, shortly after the accession of King Charles I, Morton was appointed one of the two Principal Secretaries of State, succeeding Sir Edward Conway. However, his tenure in this high office was short-lived.
Sir Albertus Morton died of the plague in London on 20 November 1625, just nine months after his appointment as Secretary of State.