Chillingham cattle, also known as Chillingham wild cattle, is a breed of cattle that live in a large enclosed park at Chillingham Castle, Northumberland, England. In summer 2022 the cattle number 138 animals with approximately equal numbers of males and females. The herd has remained remarkably genetically isolated for hundreds of years, surviving despite inbreeding depression due to the small population. There is also a small reserve herd of about 20 animals located on Crown Estate Scotland land near Fochabers, North East Scotland.