Theresa Tam FRCPC (Chinese: 譚詠詩; born 1965) is a Canadian physician and public servant who currently serves as the chief public health officer of Canada, who is the second-in-command of the Public Health Agency of Canada (PHAC). Tam initially took the role as acting CPHO following the retirement of her predecessor, Gregory Taylor, on 16 December 2016. She was formally appointed on 26 June 2017. Tam has played a leadership role in Canada's response to public health emergencies, including SARS, H1N1, MERS, Ebola, and COVID-19. She has also worked towards eradicating Polio.