Lesbian, gay, bisexual, transgender, and queer (LGBTQ) rights in Greece are among the most advanced in Europe, with the country consistently placing in top positions on LGBT rights classifications. Public opinion on homosexuality in Greece is generally regarded as culturally liberal, with civil partnerships being legally recognised since 2015 and same-sex marriage since 16 February 2024.

Both male and female types of same-sex sexual activity have been legal in Greece since 1951, and anti-discrimination laws in employment were enacted in 2005. Since then, anti-discrimination laws have been extended to other spheres, including gender identity. Hate speech and hate crime legislation is one of the most rigid and comprehensive in Europe. In 2015, civil unions (Greek: σύμφωνο συμβίωσης; cohabitation agreements) were legalised for same-sex couples, making households headed by same-sex couples eligible for many of the legal protections and rights available to married opposite-sex couples. In 2017, transgender people were granted the right to have their gender identity recognized and to change their legal sex without having to undergo surgical alteration of their genitals in order to have key identity documents changed. In February 2018, a county court in Greece granted a non-binary person the right to a gender-neutral name. In May 2018, the Greek Parliament passed a law granting same-sex couples the right to foster care children. In February 2024, the Parliament made marriage and full adoption rights available to same-sex couples.

Gay culture is vibrant in the capital of Athens, particularly in the gay neighbourhood of Gazi, in Thessaloniki and some of the Greek islands. With Greece being one of Europe's most popular LGBT tourist destinations, many establishments catering for the LGBT community can be found in islands such as Mykonos, which is known worldwide for the gay and lesbian scene. There are four LGBT pride parades held annually, in Athens, Thessaloniki, Patras and Heraklion, the capital of the island of Crete. The largest of them, the Athens Pride, saw record participation in 2015, and the attendance of many public figures including the President of the Hellenic Parliament and the Mayor of Athens.

According to recent reports carried out by ILGA-Europe, which assesses LGBT rights in European countries, Greece achieved one of the highest improvements in the legal and policy situation of LGBT people in the last decade, with an overall score of 70%, while in 2025 Greece ranked 7th in Europe out of 49 countries in LGBT rights. In April 2025, Greece announced a new policy and introduced a bill to ban surrogacy contracts for gay men and single men. In May 2025, Greece's Supreme Court upheld same-sex marriage. The official publication of the ruling was published in March 2026.

Following the country's independence from the Ottoman Empire, the penal code of 1834 stipulated that anyone guilty of sodomy shall be punished with at least one year imprisonment and police surveillance.

Male homosexual practice was decriminalized in 1951. Lesbians were not mentioned or acknowledged in the Greek Criminal Code. The Penal Code outlawed male prostitution and provided for a higher age of consent of 17 for male homosexual acts. However, this provision was abolished resulting in equalization of the age of consent and the legalization of male prostitution, subject to existing laws on the regulation of prostitution.

The age of consent in Greece is 15, In 2015, along with the legalization of same-sex civil unions, Article 347, which provided a further prohibition of seducing a male under 17 if the actor is a male adult, was repealed, therefore equalising the age of consent for homosexual acts.

The Greek Constitution provides no definition of marriage. However, it does stipulate that, like motherhood and childhood, it must be under the protection of the State. In June 2025, the Greek Council of State upheld the February 2024 legislation on both marriage and adoption for same-sex couples by a majority vote of 21-6.