Sunthorn Kongsompong was the de facto head of government of Thailand from 1991 to 1992, after a military coup d'etat led by Sunthorn and General Suchinda Kraprayoon deposed the government of Prime Minister Chatichai Choonhavan on February 23, 1991. The generals accused Chatichai of corruption, and established the National Peacekeeping Council (NPKC) as an interim administration, with Sunthorn as chairman. Anand Panyarachun was appointed Prime Minister in March, 1991, but the administration of the country was also executed by the NPKC.

The 1991 Thai coup d'état was a military coup against the democratic Chatichai Choonhavan government, carried out by Thai military leaders on 23 February. Although the figure head was Sunthorn Kongsompong, there was a military influence from military leaders, Chavalit Yongchaiyudh, Suchinda Kraprayoon, and Kaset Rojananil in the conflict. Chalerm Yubamrung, a politician, was also involved in the beginning of the conflict which began since 1990 but reached the peak in February 1991 due to a strong executive order of Chatichai. Later in May 1992, protesters calling for democracy were massacred by the military regime, known as 'Black May.'