William Osmer was an eighteenth-century English writer whose dates and personal life are only sparsely documented in publicly available sources and remain difficult to establish. His representative work, A Dissertation on Horses, is a treatise on horse breeding and horsemanship. In subject matter it belongs to the practical tradition of English agricultural and livestock writing of the period, addressing such concrete concerns as the feeding, management, and riding of horses for the benefit of landowners, grooms, and horse enthusiasts. Works of this kind tended to be plainly written and clearly organized, emphasizing practical experience and instruction rather than abstract speculation. As this is his only known surviving work, his style and intellectual outlook cannot be fully assessed, yet the book remains a useful document for understanding eighteenth-century British knowledge of horse care and attitudes toward horsemanship, and offers some reference value for the study of equine husbandry of the time.
