The House of Olivares is a Spanish noble house originating in the Crown of Castile. It is a cadet branch of the House of Medina Sidonia, originating in the sixteenth century.
Historically, the house possessed the lordships of Olivares, Seville; Heliche; Albaida del Aljarafe; Camas, Seville; Castilleja de Guzmán; Castilleja de la Cuesta; Salteras; and Tomares. The most prominent member of the House of Olivares was Gaspar de Guzmán, Count-Duke of Olivares, the favourite of Philip IV of Spain.