Juan Rejón (died 1481) was an Aragonese captain in the service of the Castilian navy, who was appointed by the Catholic Monarchs to participate in the conquest of the Canary Islands. Rejón founded the city of Las Palmas de Gran Canaria. After being named captain, he recruited a contingent of 600 men, mostly Andalusians. Their number included Alonso Fernández de Lugo, future conqueror of La Palma and Tenerife.