Thailand decriminalized sodomy in 1956.

Currently, same-sex marriage is banned in Thailand under Section 1448 in the Civil and Commerce code. Part of the section reads: “A marriage can take place only when the man and woman have completed their seventeenth year of age.” This implies that marriage is only possible between a man and a woman. There is currently a bill that is aiming to redefine marriage to terms without gender references.
On March 27th, 2024, the Thailand parliament voted on that bill which legalizes same-sex marriage, and it passed. It was then sent to the Thailand Senate, and it passed there on June 18th, 2024, with a 130 to 4 vote with 18 abstaining. The bill was then given royal approval and publishing in the Royal Gazette.

In Thailand, there are no laws restricting the discussion or promotion of LGBTQ+ topics.

Sex reassignment surgery is legal in Thailand, however, Thai law does not allow for gender to be changed on legal documents such as birth certificates.

In 1994, Thailand adopted the ICD-10 classification, which contains codes for diagnosing transsexualism in adulthood and childhood, which authorize the initiation of medical transition.

Thailand doesn't allow changing legal gender.

The Gender Equality Act B.E. 2558 was passed on March 13th, 2015, and came into effect on September 9th, 2015. The act bans discrimination based on sexual orientation and gender identity.

Under Thailand Criminal Code.

Under the revision of Thailand Criminal Code.

Adoption is only allowed for married couples, and same-sex marriage isn't allowed either. Therefore, gay people can’t adopt in Thailand.

Not criminalized.

Date shown is when US banned gay male blood donations.

In Thailand, conversion therapy is not banned, and there are reports of involuntary and coercive practices targeting LGBTQI+ individuals. According to a 2022 Human Rights report by the United States Department of State, Thai government agencies have been accused of forcing conversion therapy on LGBTQI+ people, especially children and juveniles. Marriage Equality Network reports that conversion therapy is usually forced onto individuals by their family or religious communities.

Individuals born male have been forced into military training or monkhood, and some individuals born female have experienced "corrective" rape or forced childbirth.

Intersex Thailand reports that some intersex people were forced into irreversible nonconsensual genital surgeries.

The age of consent in Thailand is 15 regardless of gender or sexual orientation.