Nils Anders Tegnell (born 17 April 1956) is a Swedish civil servant and physician specialising in infectious disease. He is the current state epidemiologist of Sweden. In his positions, he has had key roles in the Swedish response to the 2009 swine flu pandemic and the COVID-19 pandemic. During the COVID-19 pandemic in 2020, Tegnell became a divisive figure in Sweden and internationally due to the Public Health Agency of Sweden opposition to lockdowns, travel restrictions and recommending face masks for general use, which were widely adopted in many countries to curb the spread of the virus, as well as for his leading role in Sweden's controversial approach.