Deputy Minister of DefenceIn office
30 August 2014 – 23 November 2017Prime MinisterPrayut Chan-o-chaMinisterPrawit WongsuwanCommander-in-chief of the Royal Thai ArmyIn office
1 October 2014 – 30 September 2015Preceded byPrayut Chan-o-chaSucceeded byThirachai Nakwanich Personal detailsBorn (1955-08-15) 15 August 1955 (age 69)
Bangkok, ThailandSpouseVidapa SitabutrChildren2Alma materNicknameDongMilitary serviceAllegiance ThailandBranch/service Royal Thai ArmyYears of service1978–2015Rank GeneralCommandsCommander in Chief (Army)Battles/warsCommunist insurgency in Thailand
Vietnamese border raids in ThailandAwards

Udomdej Sitabutr (Thai: อุดมเดช สีตบุตร, born 15 August 1955) is a Thai military officer. He served as Commander-in-Chief of the Royal Thai Army from 2014 to 2015.^[1]

Udomdej studied at Saint Gabriel's College, an all-boys school. He then decided to go into a military career and proceeded to study at Armed Forces Academies Preparatory School (Class 14) and Chulachomklao Royal Military Academy (Class 25). Once finished in cadet school, he studied at Command and General Staff College (Class 65) and National Defence College (Class 57).^[2]

Udomdej started duty in the 21st Infantry Regiment, King's Guard, considered part of the Queen's Guards. After that, he was appointed Chief of Staff of the 1st Army Area and the Commander of 1st Army Area respectively. In 2013, he was appointed as Deputy Army Commander.^[3]

Sitabutr succeeded Prayuth Chan-ocha, who in May 2014, had seized power in a coup d'état.^[4]

He concurrently served as Secretary-General of the junta, the National Council for Peace and Order. During his tenure he was implicated in the Rajabhakti Park scandal, having overseen its construction as Chairman of the Rajabhakti Foundation.^[5][6]

Udomdej retired in 2015 and was succeeded by Theerachai Nakvanich, with whom he had had a long-running feud.^[7]

During his tenure as Commander-in-Chief of the Royal Thai Army, he received another position that was appointed by Prime Minister Prayuth Chan-ocha to become Deputy Minister of Defence under Minister Prawit Wongsuwon.^[8] He was fined from the cabinet on 23 November 2017.^[9][10]

He is the youngest of six children. One of his older siblings, Paisarn Sitabutr, is himself a retired Air Chief Marshal in the Royal Thai Air Force and a member of the National Legislative Assembly.

Udomdej received the following royal decorations in the Honours System of Thailand:

• 2014 - Knight Grand Cordon of the Most Exalted Order of the White Elephant
• 2011 - Knight Grand Cordon of the Most Noble Order of the Crown of Thailand
• 1990 - Member of the Rama Mala Medal of the Honourable Order of Rama
• 1986 - Freemen Safeguarding Medal (Second Class, First Category)
• 1991 - Border Service Medal
• 1998 - Chakra Mala Medal