is thailand considered southeast asia
Thailand, however is  clearly a part of Southeast Asia.   Countries are including Brunei Darussalam, Cambodia, Indonesia,  Laos, Malaysia, Myanmar, Philippines, Singapore, Thailand, Vietnam. There is also East Timor that isn't under ASEAN yet. Aaron McClellan. Countries are including Brunei Darussalam, Cambodia, Indonesia,  Laos, Malaysia, Myanmar, Philippines, Singapore, Thailand, Vietnam.  There is also East Timor that isn't under ASEAN yet.