Alonso del Castillo Maldonado (died after 1547) was an early Spanish explorer in the Americas. He was one of the last four survivors of the Pánfilo de Narváez expedition, along with Álvar Núñez Cabeza de Vaca, Andrés Dorantes de Carranza and his African slave Estevanico. They were the early non-native people to travel and be enslaved in the Southwest region of the modern United States. Castillo Maldonado lived with a Native American tribe in Texas in 1527 and 1528.