Beja (Portuguese pronunciation: [ˈbɛʒɐ]) is a city in the Beja Municipality in the Alentejo region, Portugal. The municipality has a total area of 1,147.1 km² and a total population of 34,970 inhabitants. The city proper has a population of 21,658.

The municipality is composed of 18 parishes, and is the capital of the Beja District. The present Mayor is Francisco Santos, elected by the Unitarian Democratic Coalition. The municipal holiday is Ascension Day. The Portuguese Air Force has an airbase in the area - the Air Base No. 11.