The Winchester Mystery House is a mansion in San Jose, California, that was once the personal residence of Sarah Winchester, the widow of firearms magnate William Wirt Winchester. The house became a tourist attraction nine months after Winchester's death in 1922. The Victorian and Gothic-style mansion is renowned for its size and its architectural curiosities and for the numerous myths and legends surrounding the structure and its former owner.

Sarah 'Sallie' Lockwood Winchester was an American heiress who amassed great wealth after the death of her husband, William Wirt Winchester, and her mother in law, Jane Ellen Hope.