Wanchai Yiamsamatha


Wanchai's practice focuses mainly on administrative and constitutional law, and regulatory law.

He has extensive expertise in administrative and constitutional law, frequently involved in sophisticated and innovative cases.

He not only represents private plaintiffs in challenging the state, but also defends administrative agencies in the administrative courts and the Constitutional Court.

He has strong expertise in providing complex legal analysis on administrative procedure law, administrative court law, constitutional law, factory law, telecommunications law, energy law, procurement law, consumer protection law, and other regulatory laws.

He teaches administrative and constitutional law at universities.

He is currently a legislative expert attached to a Senator, and also serves as an adviser to the executive board of the Master’s Degree Project for Financial Executives (Special Class), Business School, Kasetsart University.

He was a legislative expert attached to a member of National Legislative Assembly (2014-2019), a member of the Committee on Economics and Foreign Affairs, of the Lawyers Council of Thailand (2010-2013), and a member of the Committee on Law Drafting and Revision, of the Ministry of Justice (2009). He was a member of the sub-committee of the Extraordinary Committee on Intention Records, Archive and Minutes Scrutiny, of the Constitutional Drafting Assembly (2007), and a member of the National Human Rights Commission sub-committee on the Scrutiny of Violations of Economic, Social and Culture Rights (2010-2015).

He has been consistently acknowledged by Asia Leading Lawyers in 2009, 2010, and 2012 as the prominent and leading lawyer in Regulatory & Government. In Dispute Resolution, Asian Leading Lawyer acclaimed him as the leading lawyer in 2011-2014 and 2016-2019. For Chambers & Partners Asia Pacific, he has been recognized in Dispute Resolution as a Band 2 leading Lawyer in 2015 and as a Band 3 leading Lawyer in 2018 and 2019. He was also ranked as a Band 2 leading Technology, Media, Telecoms Lawyer in 2017. The Legal 500 Asia Pacific listed him as a leading individual in Dispute Resolution in 2018 and 2019. Benchmark Litigation Asia-Pacific has ranked him as a Dispute Resolution Star in Government and Regulatory in 2019.

Wanchai obtained his LLB from Thammasat University and is admitted to the Thai Bar.

He received an LLM from Southern Methodist University, an LLM from the University of Pennsylvania, the Certificate of Achievement on the Training Programme for Administrative Case Officials for the General Public from Chulalongkorn University and the Office of the Administrative Courts, the Certificate on Administrative Justice for Executives, from the Administrative Justice College, of the Office of the Administrative Courts, the Certificate on Justice Administration for Executives from the Office of Justice Affairs, Ministry of Justice.


Wanchai Yiamsamatha


Tel+66 2627 3443 ext 115