The COVID-19 pandemic in Ontario was a viral pandemic of coronavirus disease 2019 (COVID-19), a novel infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The first confirmed case of COVID-19 in Canada was announced on January 25, 2020, involving a traveller who had recently returned to Toronto from travel in China, including Wuhan. Ontario has had the largest number of confirmed COVID-19 cases among Canada's provinces and territories, but due to having the largest population, only ranks sixth adjusted per capita. Ontario surpassed one million lab-confirmed COVID-19 cases on January 24, 2022; one day before the anniversary of the first confirmed case on January 25, 2020.