Homosexuality was decriminalized in Andorra at the same time that it was in France, in the late 18th Century, when the new penal code was introduced in both countries.

Anti-discrimination laws are part of the Andorran Constitution including discrimination on the grounds of sexual orientation. Such discrimination is illegal in the workplace, in state-controlled media, and regarding access to goods and services, housing, and healthcare. Although there have been no court cases, it is generally understood that the term ‘sexual orientation’ includes sexual orientation and gender identity. (Penal Code in Catalan)

There exists also a ‘Stable Union’ between same-sex couples that can be registered at the state level that affords the couple the same duties and benefits as a married couple in terms of single-parent adoption (but not as a couple), economic rights, and inheritance rights. There is also a right to maintenance after the dissolution of a stable union. However, marriage per se is not legal between members of the same sex. (Legislation in Catalan)

Notes on the Andorran Legal System:
Andorra is a parliamentary co-principate that requires its new legislation to be endorsed by both the French co-principate (the president of France) and the Spanish co-principate (the bishop of La Seu d’Urgell, Catalunya). If one of the co-principates disagrees with the legislation to be passed, they can hold an unconstitutionality appeal. If this fails, then the signature of the other co-prince will do to ratify the legislation (as happened with the Stable Union Legislation which was approved only by the President of France). Note that the Andorran people have no rights in terms of the election of the co-princes. (Information on the legal system is available here).

Gender reassignment (Sections B14 and B15, COWI Report) at any time after the birth of a child is not supported by the healthcare system (except at childbirth if the child is born intersex). At present there have been no cases in Andorran hospitals of gender reassignment after birth. It is not possible to alter the gender of the person on national documents if they opt for gender reassignment surgery elsewhere and have the reassignment recognised in Andorra for the purposes of name changes, although it is illegal to dismiss someone from their employment on the grounds of them having had a gender reassignment operation (Section B9, COWI Report).

Although Andorra has numerous rights protecting LGBTIs within their state, they are not a signatory to the 1951 convention and hence do not provide protection to refugees coming from other countries who are being persecuted on the grounds of their sexual orientation or gender identity. As Andorra does not have any airports or a coastline, it is not possible to arrive there as the first country of entry.