China holds a national day of mourning for martyrs who died in the fight against the novel coronavirus disease outbreak.

A national day of mourning is a day, or one of several days, marked by mourning and memorial activities observed among the majority of a country's populace. They are designated by the national government. Such days include those marking the death or funeral of a renowned individual or individuals from that country or elsewhere or the anniversary of such a death or deaths, wartime commemorations, or the occurrence or anniversary of a significant disaster either in the country or in another country. Flying a national or military flag of that country at half-mast is a common symbol.

The COVID-19 pandemic in mainland China is part of the worldwide pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). China was where the first COVID outbreak occurred, the first where authorities imposed drastic measures in response, and was one of the first countries to bring the outbreak under control, at least temporarily.