Canadian Forces Base London (also CFB London) is a former Canadian Forces Base that was located in London, Ontario, Canada. It was downsized and closed during defence budget cutbacks in the 1990s. Local Primary Reserve units are now supported by Area Support Unit (ASU) London which is located in some of the remaining base buildings. As the site of the first purpose-built infantry training school erected by the federal government and an early symbol of the establishment of a permanent military force in Canada, part of the base was designated a National Historic Site of Canada in 1963.