António A. de Freitas
António A. de Freitas (born December 22, 1947), is an immunologist. He is Portuguese, born in Cuamba, Mozambique. He earned his M.D. in 1970 from the University of Lisbon, Portugal, and his Ph.D. in 1976 from the University of Glasgow, Scotland, UK. He is Professor at the Pasteur Institute, Paris, France where he directs a research unit  and a URA CNRS. He was head of the Department of Immunology of the Pasteur Institute from 1997-2000. His major scientific contributions are in the area of lymphocyte homeostasis. In 2009 he published a textbook in immunology entitled "Tractus immuno-logicus: a brief history of the immune system". In 2010 received a European Research Council advanced grant.
- Freitas has been involved in over 130 publications.
- "Immunology at Asilomar: from molecules to mice". Nature Immunology. 4: 300–302. doi:10.1038/ni0403-300. Retrieved 22 February 2013.
- "Eco-immunity". The Economist. 21 May 1998. Retrieved 22 February 2013.
- Freitas, AA; Rocha, B. "Population biology of lymphocytes: the flight for survival". Annual Review of Immunology. 18: 83–111. doi:10.1146/annurev.immunol.18.1.83. PMID 10837053.