José Agustín de Lecubarri y Gorostiza, KB (25 June 1802 – 6 January 1874), was an Anglo-Spanish diplomat, naval officer and peer, who was noted for being the youngest person ever to be named Consul General and hold office for foreign affairs. His significant diplomatic achievements during the First Carlist War earned him the Grand Cross of the Order of Isabella the Catholic, as well as the Order of Charles III.