Roberto Delgado Martillo (born April 3, 1975) is an 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.
Delgado's swimming career is also overshadowed by a doping suspicion, when FINA has ordered him a one-month ban for failing the drug test.
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.