George Montagu, 1st Duke of Montagu

His Grace The Duke of Montagu KG, PC, FRS
The Duke of Montagu.
Personal details
Born	26 July 1712 Cardigan House, Lincoln's Inn Fields, London, England
Died	23 May 1790 (1790-05-24) (aged 77) Privy Gardens, Whitehall, London
Nationality	British
Spouse(s)	Lady Mary Montagu (c. 1711–1775) Dorothy Charlotte Sawbridge (1766-1821)
Alma mater	Queen's College, Oxford

George Montagu, 1st Duke of Montagu KG, PC, FRS (26 July 1712 – 23 May 1790) styled Lord Brudenell until 1732 and known as The Earl of Cardigan between 1732 and 1766, was a British peer.

He was born George Brudenell at Cardigan House, Lincoln's Inn Fields, in London, the eldest son of George Brudenell, 3rd Earl of Cardigan and his wife Lady Elizabeth Bruce, daughter of Thomas Bruce, 3rd Earl of Elgin. He was baptised on 1 August 1712 at St Giles-in-the-Fields. He was the elder brother of James Brudenell, 5th Earl of Cardigan, the Honourable Robert Brudenell and Thomas Brudenell-Bruce, 1st Earl of Ailesbury. He matriculated at Queen's College, Oxford on 1 July 1726 and graduated from there on 31 January 1729 with a Master of Arts degree.

Brudenell succeeded his father in the earldom 1732. In 1742 he was appointed Justice in Eyre north of the Trent, a post he held until 1752. He inherited the estates of his father-in-law, the 2nd and last Duke of Montagu (see below), in 1749, and assumed the surname "Montagu" for himself and his children on 15 July 1749. In 1752 he was made a Knight of the Garter and made Constable and Governor of Windsor Castle, which he remained until his death. In 1766 he was created Marquess of Monthermer and Duke of Montagu, revivals of the titles which had become extinct on his father-in-law's death.