According to Article 31 of the ASEAN Charter, the Chairmanship of ASEAN shall rotate annually, based on the alphabetical order of the English names of Member States. A Member State assuming the Chairmanship shall chair the ASEAN Summit and related summits, the ASEAN Coordinating Council, the three ASEAN Community Councils, relevant ASEAN Sectoral Ministerial Bodies and senior officials, and the Committee of Permanent Representatives.
Thailand is the Chair of ASEAN for 2019 and the theme of its ASEAN Chairmanship is “Advancing Partnership for Sustainability”. For more information on Thailand chairmanship: https://www.asean2019.go.th/en/
Previous and current Chairs of ASEAN over the years: