Milton Thiago de Mello (5 February 1916 – 1 October 2024) was a Brazilian primatologist.
He was a consultant with the Pan-American Health Organization and the Food and Agriculture Agency of the United Nations.
He belonged to more than 30 Brazilian and international scientific societies, of which he had helped found 14 and served as an official of at least 12.
He was the author of numerous books and over 150 scientific papers on primates, brucellosis, bubonic plague, medical mycology, the teaching of veterinary medicine, and the environmental crisis in Brazil and other countries.
The recently founded Milton Thiago de Mello Environmental Institute, in Sobradinho, Distrito Federal, Brazil, is named after him.