A person born to a Thai national parent is a Thai national at birth under the Nationality Act. Birth in Thailand alone to two foreign parents is not unconditional jus soli.
Sources: Thailand Nationality Act B.E. 2508 (amended; UNHCR English text)
A foreign woman married to a Thai man may naturalize after about three years of residence, with a lower income threshold and no language test.
Sources: Thailand Nationality Act B.E. 2508 (amended; UNHCR English text)
A person acquires Thai nationality by birth when a parent is a Thai national under the Nationality Act lineage rules, including specified transmission through a Thai father or mother and related acknowledgment situations.
Sources: Thailand Nationality Act B.E. 2508 (amended; UNHCR English text)
A foreigner may be naturalized as a Thai national with permission of the Minister of Interior and Cabinet approval after meeting the statutory conditions of the Nationality Act, which ordinarily include majority and capacity, good conduct, lawful occupation, knowledge of Thai sufficient for communication, and domicile in Thailand for not less than five consecutive years under a permanent-residence qualification, unless a shorter statutory path applies (for example certain spouses of Thai nationals). Naturalization remains highly discretionary.
Sources: Thailand Nationality Act B.E. 2508 (amended; UNHCR English text)
10-year Long-Term Resident visa for high-net-worth individuals investing in Thailand.
Sources: Thailand LTR Visa — BOI
10-year Long-Term Resident visa for retirees aged 50+ with sufficient passive income.
Sources: Thailand LTR Visa — BOI
10-year Long-Term Resident visa for remote employees of established foreign companies.
Sources: Thailand LTR Visa — BOI