Martial law is the replacement of civilian government by military rule and the suspension of civilian legal processes for military powers. Martial law can continue for a specified amount of time, or indefinitely, and standard civil liberties may be suspended for as long as martial law continues. Most often, martial law is declared in times of war and/or emergencies such as civil unrest and natural disasters. Alternatively, martial law may be declared in instances of military coup d'états.

On 22 May 2014, the Royal Thai Armed Forces, led by General Prayut Chan-o-cha, Commander of the Royal Thai Army (RTA), launched a coup d'état, the 12th since the country's first coup in 1932, against the caretaker government of Thailand, following six months of political crisis. The military established a junta called the National Council for Peace and Order (NCPO) to govern the nation. The coup ended the political conflict between the military-led regime and democratic power, which had been present since the 2006 Thai coup d'état known as the 'unfinished coup'. 7 years later, it had developed into the 2020 Thai protests to reform the monarchy of Thailand.