The COVID-19 pandemic in Mongolia is part of the ongoing worldwide pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The COVID-19 pandemic was confirmed to have reached Mongolia when its first case was confirmed in a French man who traveled from Moscow to Dornogovi on 10 March 2020.Mongolia is the third most affected country in East Asia, after Japan and South Korea. As of the end of September 2021, there are 304,084 cases and 1,277 deaths in the country.On 20 June 2021, Mongolia overtook China in terms of the number of COVID-19 cases, becoming the third most affected country in East Asia. Three days later, on 23 June, the number of COVID-19 cases in the country crossed the 100,000-mark. On 26 August, the number of COVID-19 cases in Mongolia crossed the 200,000-mark. More than a month later, on 29 September, the number of COVID-19 cases in the country crossed the 300,000-mark.