John William Montagu, 7th Earl of Sandwich PC, styled Viscount Hinchingbrooke from 1814 to 1818, was a British peer and Conservative politician. He served under Lord Derby as Captain of the Honourable Corps of Gentlemen-at-Arms in 1852 and as Master of the Buckhounds between 1858 and 1859.

The Captain of the Honourable Corps of Gentlemen-at-Arms is a post in the Government of the United Kingdom that has been held by the Government Chief Whip in the House of Lords since 1945. Prior to 17 March 1834, the Gentlemen-at-Arms were known as the Honourable Band of Gentlemen Pensioners.