Horse chestnut may refer to: Horse-chestnut tree or Aesculus hippocastanum, a species of large deciduous tree Horse chestnuts, Eurasian species of the genus Aesculus Horse Chestnut (horse), a South African Thoroughbred racehorse Chestnut (coat), a common coat color in horses Chestnut (horse anatomy), the callous on the leg of a horse See also Horse-chestnut leaf miner, a moth of the lepidopteran family Gracillariidae Chestnut (disambiguation)