John Montagu, 5th Earl of Sandwich, PC (26 January 1744 – 6 June 1814), styled Viscount Hinchingbrooke until 1792, was a British peer and Tory politician.

[3] Lord Sandwich married firstly his distant cousin Lady Elizabeth Montague-Dunk, only daughter of the 2nd Earl of Halifax, 8 March 1766.

Lord Sandwich lived and was a rural landowner at Hinchingbrooke House today in north Cambridgeshire and held other farming interests.

Lord Sandwich died in June 1814, aged 70, and was succeeded by his eldest son by his second wife, George.

Lord Sandwich had two children by his first wife, Lady Elizabeth Montague-Dunk: After Lady Elizabeth's death on 1 July 1768, Lord Sandwich married Lady Mary Powlett on 25 April 1772: Lord Sandwich also had two illegitimate children, a daughter called Harriet Montagu, who married James Grant, son of Sir Ludovic Grant of Dalvey, 6th Bt.