Lieutenant-Colonel Peregrine Francis Cust (13 August 1791 – 15 September 1873) was a British Tory Member of Parliament (MP). Cust was the son of Brownlow Cust, 1st Baron Brownlow, by Frances, daughter of Sir Henry Bankes, of Wimbledon. He was the brother of John Cust, 1st Earl Brownlow, William Cust and Sir Edward Cust, 1st Baronet. He was returned to Parliament at the 1818 general election as one of two members for the borough of Honiton in Devon, and re-elected there in 1820.