The Rio Santiago poison dart frog, Adelphobates captivus, is a species of poison dart frog native to Peru and southern Ecuador. It is an average poison dart frog in terms of size, toxicity, and behaviour. A. captivus is one of the most sought-after poison dart frogs by herpetoculturists due to the fact that it is fairly rare in captivity and challenging to keep. It is the sister species to A. mysteriosus.