Adolph Francis Alphonse Bandelier (August 6, 1840 - March 18, 1914) was a Swiss-born American archaeologist who particularly explored the indigenous cultures of the American Southwest, Mexico, and South America. He immigrated to the United States with his family as a youth and made his life there, abandoning the family business to study in the new fields of archeology and ethnology.
Bandelier National Monument in New Mexico was named for him, as his studies established the significance of this area in the Jemez Mountains for archeological and historic preservation of sites of Ancestral Puebloans dating to two eras from 1150 to 1600 CE.
Bandelier was born in Bern, Switzerland. As a youth, he emigrated to the United States with his family, which settled in Highland, Illinois, a community established by other Swiss immigrants. He labored unhappily in the family business as a young man. He became acquainted with the pioneering anthropologist Lewis Henry Morgan of New York, who served as his mentor as Bandelier turned to scholarship. In particular, he undertook archaeological and ethnological work among the Native Americans of the southwestern United States, Mexico, and South America.
Beginning his studies in Sonora (Mexico), Arizona, and New Mexico, Bandelier developed as the leading authority on the history of this region. With F. H. Cushing and his successors, he became one of the leading authorities on its prehistoric civilization, at a time when archeology and ethnology were new fields of study.
In 1892 Bandelier left the Southwest to travel and conduct research in Ecuador, Bolivia, and Peru, where he continued ethnological, archaeological, and historical investigations. In the first field he was in a part of his work connected with the Hemenway Archaeological Expedition. In the second he worked for Henry Villard of New York City and for the American Museum of Natural History of the same city. Bandelier had shown the falsity of various historical myths, notably in his conclusions respecting the Inca civilization of Peru.