Thailand's foreign policy includes support for ASEAN in the interest of regional stability and emphasis on a close and longstanding security relationship with the United States.

Thailand participates fully in international and regional organizations. It has developed increasingly close ties with other ASEAN members--Indonesia, Malaysia, the Philippines, Singapore, Brunei, Laos, Cambodia, Burma, and Vietnam--whose foreign and economic ministers hold annual meetings. Regional cooperation is progressing in economic, trade, banking, political, and cultural matters. In 2003, Thailand served as APEC host. Supachai Panitchpakdi, the former Deputy Prime Minister of Thailand, currently serves as Director-General of the World Trade Organization (WTO).

In recent years, Thailand has taken an increasingly active role on the international stage. When East Timor gained independence from Indonesia, Thailand, for the first time in its history, contributed troops to the international peacekeeping effort. Its troops remain there today as part of a UN peacekeeping force. As part of its effort to increase international ties, Thailand has reached out to such regional organizations as the Organization of American States (OAS) and the Organization for Security and Cooperation in Europe (OSCE). Thailand has contributed troops to reconstruction efforts in Afghanistan and Iraq.