Horse chestnut (disambiguation)

Horse chestnut may refer to:
 * Aesculus hippocastanum, a species of large deciduous tree native to Europe and planted around the world as an ornamental tree
 * Aesculus glabra, a species of medium-sized deciduous tree also called Ohio buckeye native to the continental US and Canada
 * Aesculus californica, California horse-chestnut or California buckeye, a species of large deciduous shrub or small tree
 * 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