Carlos Alberto Arroyo del Río (27 November 1893 – 31 October 1969) was President of Ecuador from 1940 to 1944. He was a member of the Ecuadorian Radical Liberal Party.
During his term, the country decisively lost the 1941 Ecuadorian–Peruvian War. Ecuador was forced to sign highly unfavorable peace terms at the 1942 Inter-American Conference in Rio de Janeiro, renouncing 200,000 square kilometres of territory.