Jaén can refer to:
Jaén (pronounced: [xaˈen]) is a province of southern Spain, in the eastern part of the autonomous community of Andalusia. It is bordered by the provinces of Ciudad Real, Albacete, Granada and Córdoba. Its capital is Jaén city.
Its area is 13,484 km². Its population is 657,387 (2003), of whom just about one-sixth live in the capital. It contains 97 municipalities. The highest point of the province is Pico Mágina (2165 m).
One of the lesser known provinces of Spain compared to the heavily tourist-oriented coast, it has four national parks, and many other protected natural areas. The province also contains two Renaissance cities, Úbeda and Baeza, both recently declared a World Heritage Site by UNESCO.
The annual chess tournament held in Linares attracts many of the world's best players.
Jaén is one of the largest producers of olive oil in the world. It produces around 45% of all Spanish production and 20% of world's production. For this reason the province is also known as World Capital of Olive Oil. The production of the province in 2013 was 749.387 t of olive oil.
Jaén is one of the 52 electoral districts (Spanish: circunscripciones) used for the Spanish Congress of Deputies - the lower chamber of the Spanish Parliament, the Cortes Generales.
Under Article 68 of the Spanish constitution the boundaries must be the same as the province of Jaén and under Article 140 this can only be altered with the approval of congress. Voting is on the basis of universal suffrage in a secret ballot. The electoral system used is closed list proportional representation with seats allocated using the D'Hondt method. Only lists which poll 3% or more of all valid votes cast, including votes "en blanco" (i.e. for "none of the above") can be considered for seats. Under article 12 of the constitution, the minimum voting age is 18.
Article 67.3 of the Spanish Constitution prohibits dual membership of the Cortes and regional assemblies, meaning that candidates must resign from Regional Assemblies if elected. Article 70 also makes active judges, magistrates, public defenders, serving military personnel, active police officers and members of constitutional and electoral tribunals ineligible.