Aranese (Occitan: aranés) is a standardized form of the Pyrenean Gascon variety of the Occitan language spoken in the Val d'Aran, in northwestern Catalonia close to the Spanish border with France, where it is one of the three official languages beside Catalan and Spanish. In 2010, it was declared the third official language in Catalonia by the Parliament of Catalonia.

The official names of towns in Val d'Aran are in Occitan; for example, the municipality of Vielha is known by its Occitan name on maps and road signs, rather than its Catalan/Spanish name, Viella.

The Aran Valley is the only territory in the language domain of Occitania where Occitan has official recognition and institutional protection. According to Law 35/2010 passed by the Parliament of Catalonia, Occitan is considered an official language not only in Val d'Aran, but in all of Catalonia, and is given precedence in the territory where it is spoken (Val d'Aran).

Article 3.4 of Catalonia's 1979 Statute of Autonomy establishes that the "Aranese language will be the object of education and of special respect and protection." Subsequently, Law 7/1983, on linguistic normalization, declares Aranese the language of Aran, proclaims certain linguistic rights of the Aranese and directs public service to guarantee its usage and teaching. Aranese is taught on all levels of compulsory education and has been the medium of instruction in the Aran Valley since 1984.

A certain degree of autonomy was granted to the Aran Valley in 1990. Law 16/1990, concerning the special regime of the Val d'Aran, grants to the Valley an administrative autonomy. This law affirms the official status of Aranese, further guarantees its use and teaching, and affirms the general mandate to promote its normalization in Aran.

Law 1/1998, on linguistic policy, includes specific provisions related to place names, anthroponymy, and the media. Although the localities of Catalonia have their official names in Catalan, the localities of the Aran Valley have their official names in Occitan. Thus, the indicators of the towns and the names of their streets are written in this language. Since May 2001, there is an official regulation of the General Council of Aran that promulgates the certification system of the different levels of knowledge of Occitan.

In 2006, a new Statute of Autonomy was promulgated in Catalonia. Concerning Aranese, article 6.5 of the organic law establishes that "the Occitan language, called Aranese in Aran, is the language of this territory and is official in Catalonia, in accordance with the provisions of this Statute and the laws of linguistic normalization." In 2010, Law 35/2010 was subsequently passed, with specific provisions concerning Occitan in Catalonia reflecting the new constitutional framework.

In 2011, the Spanish Government, specifically that of the People’s Party and Citizens, opposed the preference given to Aranese by the 2010 law, questioning the constitutionality of articles 2.3, 5.4, 5.7 and 6.5. In 2018, the constitutional court ruled that while article 2.3 was found to be constitutional, the "preferential" status given found in the other concerned articles are unconstitutional.