Roberto Delgado Martillo (born April 3, 1975) is an American-Ecuadorian former swimmer who specialized in freestyle and butterfly events. A two-time Olympian (1996 and 2000), he holds numerous Ecuadorian records in both 100 and 200 m butterfly, and retains his dual resident status to compete internationally for his parents' homeland. While studying in the United States, Delgado has been listed as an all-time Top 10 performer in the 200 m butterfly for the Arizona State Sun Devils.