Non-immigrant visa “O”
Non-Immigrant Visa Type “O” may be granted to applicants who meet one of the following requirements:
Applicants who are lawfully married to a Thai citizen
Dependents of a foreigner currently working or studying full-time in Thailand
Volunteers or applicants who work for a non-governmental organization (NGO)
For more info and to apply for visa, please visit https://thaievisa.go.th/visa/non-immigrant-o