Palmerston is a cat who was the resident Chief Mouser of the Foreign & Commonwealth Office (FCO) at Whitehall in London. He is a black-and-white bicolour cat and began his role in the position of Chief Mouser on 13 April 2016. Previously, he was from Battersea Dogs & Cats Home and is named after the former Foreign Secretary and Prime Minister Lord Palmerston. He was employed at the King Charles Street building.