COVID-19 pandemic in Thailand

The COVID-19 pandemic in Thailand is a part of the worldwide pandemic of COVID-19 caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Thailand was the first country to report a case outside China, on 13 January 2020. As of 2 April 2022, the country has reported a cumulative total of 3,684,755 confirmed cases, with 25,318 deaths from the disease, and currently ranked fourth in the number of cases in Southeast Asia, behind Vietnam, Indonesia, and Malaysia.

Thailand was relatively successful in containing the pandemic throughout most of 2020, but has been experiencing an uncontrolled resurgent outbreak since April 2021. An initial wave of infections, mostly traced to nightlife venues and a boxing match in Bangkok, peaked on 22 March 2020 at 188 newly confirmed cases per day. As preventive measures were implemented, the outbreak subsided by May, and the country reported almost no locally transmitted infections until December, when it saw a surge of infections primarily clustered around large migrant worker communities in Samut Sakhon province. The new outbreak spread to many provinces, with a maximum daily of 959 cases reported on 26 January 2021, before partially subsiding in February. In April, however, a new wave of infections originated from Bangkok's Thong Lo–area nightlife venues and rapidly spread in Bangkok as well as throughout the country. It was identified to be of the highly transmissible Alpha variant first reported from the United Kingdom, and by 14 April, over a thousand cases per day were being identified, causing a shortage of hospital beds as government policy required admission of all confirmed cases.

The Thai government's response to the outbreak was initially based on surveillance and contact tracing, though it was late to implement clear quarantine measures.