Nils Anders Tegnell (born 17 April 1956) is a Swedish physician specialising in Infectious disease and civil servant, and the current state epidemiologist of Sweden. He was employed by the Swedish Institute for Communicable Disease between 2004 and 2005, and the Swedish National Board of Health and Welfare between 2005 and 2012. He returned to the Institute for Communicable Disease in 2012 as a head of department. He has served as state epidemiologist since 2013, first at the Institute, and later at the Public Health Agency of Sweden.