Avendaño is a Spanish surname. It is believed to have originated in Galicia, then passed to the Basque Country, and later spread to other areas of Spain and to Latin America. It may refer to:
Manuel Avendaño, MTV/Billboard celebrity artist, actor, executive director/producer, songwriter and entrepreneur.
Dr. Diego Núñez de Avendaño, Peruvian 16th century judge and, briefly, viceroy of Peru
Diego de Avendaño, Spanish-Peruvian 17th century Jesuit academic
Fernando Avendaño, Peruvian 17th century priest
Guillermo Flores Avendaño, President of Guatemala briefly in 1957-58
Hugo Avendaño, Mexican singer and actor
Jorge Avendaño, Mexican pianist, composer, songwriter and music producer
Juan Avendaño, Spanish tennis player
Juan Pablo Avendaño, Argentine footballer
Manuel Avendaño, Chilean footballer
Nazareth Avendaño, Costa Rican diplomat
Pedro de Avendaño, Spanish conquistador
Pedro Medina Avendaño, Colombian poet
Serafín Avendaño, Spanish painter
Víctor Avendaño, Argentine boxer
Santiago Avendaño, Argentine polo player
Benjamin Avendaño, Argentine polo player
Joaquin Avendaño, Argentine polo player
Gonzalo Avendaño, Argentine polo player