John Montagu, 4th Earl of Sandwich, English politician, Secretary of State for the Northern Department (born 1718)

John Montagu, 4th Earl of Sandwich, PC, FRS was a British statesman who succeeded his grandfather Edward Montagu, 3rd Earl of Sandwich as the Earl of Sandwich in 1729, at the age of ten. He held various military and political offices during his life, including Postmaster General, First Lord of the Admiralty, and Secretary of State for the Northern Department. He is also known for the claim that he was the inventor of the sandwich.

The secretary of state for the Northern Department was a position in the Cabinet of the government of Great Britain up to 1782. Following this, the Northern Department became the Foreign Office, and the position evolved into the foreign secretary.