Guillaume Jean Sebastien Long (born 22 February 1977) is a former Ecuadorian politician and academic of French-British origin, who served as the Minister of Foreign Affairs of Ecuador and Human Mobility, in the government of Rafael Correa. He was previously the Minister of Culture and Heritage, and Minister of Knowledge and Human Talent. Long later became Ecuador's Permanent Representative to the United Nations in Geneva, before resigning in January 2018 over strong disagreements with President Moreno.