General elections were held in Thailand on 23 December 2007. They were the first elections after the Council for National Security, a military junta, had overthrown Thailand's elected government and abrogated the constitution on 19 September 2006. The junta had canceled general elections scheduled for October 2006 and promised new elections within 12 months. The Constitutional Tribunal then outlawed the Thai Rak Thai party, the largest political party in Thailand, and banned TRT executives from contesting in the elections for five years. After their political party had been dissolved, the former TRT members regrouped under the band of People's Power Party (PPP) led by Samak Sundaravej, a seasoned politician. Following its formation, the junta issued a classified order to suppress the activities of the PPP and to frame it for lèse majesté. The order was leaked to the public, leading to a complaint towards the Election Commission from the PPP. However, the Election Commission dismissed the complaint on the grounds that the Council for National Security (CNS) had granted itself immunity in the 2007 Constitution of Thailand.

The junta deployed 200,000 soldiers and police officers to maintain security and 1,500 officers to supervise after election fraud. Charnchai Silapauaychai, a popular former Democrat Party member from Phrae who switched to the PPP for the 2008 election, was assassinated. Five men, one of them cousin of a powerful Democrat Party MP were arrested, but all denied involvement.

Despite being the junta's target for suppression, the PPP won 233 out of 480 parliamentary seats, close to controlling the majority in the House of Representatives. The Democrat Party came in a distant second with 165 seats, followed by Chart Thai with 37, For the Motherland with 24, Ruam Jai Thai Chat Pattana with 9, the Neutral Democratic Party with 7, and Pracharaj with 5.

Although the junta initially scheduled the elections within 12 months after the September 2006 coup, Minister in the Prime Minister's Office Thirapat Serirangsan later announced that the elections might not occur until one year and five months, which would put the election in February or March 2008. On the other hand, the chairman of the Constitution Drafting Council, Noranit Sethabutr, said in January that the timetable was to hold a constitutional referendum in August and elections between October and December; any problems in drafting the constitution or ratifying it through the referendum would delay the election date. This timetable was later tightened even further, with elections planned by the end of September 2007. A preliminary date was set in March 2007 for the elections to be held on 16 December 2007 or 23 December 2007. After the constitutional referendum, it was announced that the most likely date would be 23 December, which was formally agreed upon on 27 August 2007.

With the new constitution the number of MPs was reduced to 480, with 400 elected directly by the 157 constituencies and 80 elected by proportional votes in each of the eight electoral areas. Depending on the size of the population, each constituency may have up to three MPs.

Early voting started on 15 December 2007.

The eight electoral areas were designed such that they contain equal numbers of population.

Some of the political parties contesting in this election, covering 157 constituencies and 80 party-list seats, are: