Extremadura (Spanish: [e(k)stɾemaˈðuɾa]; Extremaduran: Estremaúra; Portuguese: Estremadura; Fala: Extremaúra) is an autonomous community of Spain. Its capital city is Mérida. Located in the central-western part of the Iberian Peninsula, it is crossed from east to west by the Tagus and Guadiana rivers. The autonomous community is formed by the two largest provinces of Spain: Cáceres and Badajoz. Extremadura is bordered by Portugal to the west and by the autonomous communities of Castile and León (north), Castilla–La Mancha (east) and Andalusia (south).

It is an important area for wildlife, particularly with the major reserve at Monfragüe, which was designated a National Park in 2007, and the International Tagus River Natural Park (Parque Natural Tajo Internacional). The regional executive body, led by the President of Extremadura, is called Junta de Extremadura.

The Day of Extremadura is celebrated on 8 September. It coincides with the Catholic festivity of Our Lady of Guadalupe.

The region, featuring a huge energy surplus and hosting deposits of lithium, is at the forefront of Spain’s plans for energy transition and a decarbonisation.