Constitution Drafting Assembly of Thailand (Thai: สภาร่างรัฐธรรมนูญแห่งราชอาณาจักรไทย; rtgs: Sapha Rang Ratthathammanun Haeng Ratcha Anachak Thai), or, in brief, CDA (Thai: สสร.), is a legislative body in Thailand bearing the duty to draw up a permanent Constitution of the Kingdom of Thailand. This kind of Assembly has usually been established after a military junta seized power in the country or by reason of the need to solve political crises in the country.
The Constitution of the Kingdom of Thailand, BE 2492 (1949) was the first constitution having been prepared by the CDA.
Under the premiership of Banharn Silpa-Archa, there were public demands to have the politics reformed and the constitution amended. The Government then caused a CDA to be established by amending the Constitution of the Kingdom of Thailand, BE 2534 (1991) to make provisions for having a new constitution.
At that time, the CDA established consisted of 99 members being 76 deputies elected by citizens of 76 Chanagwats, and 23 academicians from higher education institutes.
Bhumibol Adulyadej appointed Uthai Phimchaichon as the CDA President.
The success of the CDA was the well-known Constitution of the Kingdom of Thailand, BE 2540 (1997).
The CDA has been established once again after the Constitution of the Kingdom of Thailand, BE 2540 (1997) has been abrogated by the Council for Democratic Reform (CDR), a military junta which seized power in 2006.