Edwin O'Neill Willis (18 January 1935 – 11 April 2015) was an American ornithologist who studied the birds of Central and South America.

[1] Willis was interested in birds from an early age and published his first article in 1949 when he was 14 years old.

[1] In 1982 he was appointed to a faculty position at the São Paulo State University (Universidade Estadual Paulista) in Rio Claro, Brazil, where he taught until his retirement in 2005.

[5] His name is also used for a subspecies of the red-throated ant tanager (Habia fuscicauda willisi).

[7] The common scale-backed antbird was moved to a new genus Willisornis, a name chosen by the Brazilian ornithologists Carlos Agne and José Fernando Pacheco to honour Willis.