Thai Nation Party, or Chart Thai Party was a conservative political party in Thailand. It was dissolved by the Constitutional Court of Thailand on December 2, 2008, along with the People's Power Party and the Neutral Democratic Party, for having violated electoral laws in the 2007 Thai general election. Thereafter, most MPs founded the Chart Thai Pattana Party, which became the Thai Nation Party's successor.

General elections were held in Thailand on 6 February 2005. The result was a landslide victory for the Thai Rak Thai party of Prime Minister Thaksin Shinawatra, which won 377 of the 500 seats in the House of Representatives, with its former coalition partner, the Chart Thai Party taking 25 seats. The opposition Democrat Party of Thailand won only 96 seats and the newly formed Mahachon Party took two seats.