Baranya or Baranja (Hungarian: Baranya; Croatian: Baranja; Serbian: Барања, Baranja, pronounced [bǎraɲa]; German: Branau) is a geographical region between the Danube and the Drava rivers. Its territory is divided between Hungary and Croatia. In Hungary, the region is included into Baranya county, while in Croatia, it is included into Osijek-Baranja county.

The name of the region come from the Slavic word 'bara', which means 'swamp', thus the name of Baranya means 'a swamp land'. Even today large parts of the region are swamps, such as the natural reservation Kopački Rit in its southeast. Another theory states that the name of the region come from the Hungarian word 'bárány', which means 'lamb'.

During the history, the region of Baranya was part of the Roman Empire, the Hunnic Empire, the Kingdom of the Ostrogoths, the Kingdom of the Lombards, the Avar Kingdom, the Frankish Empire, the Balaton Principality, the Bulgarian Empire, the Kingdom of Hungary, the Ottoman Empire, the Habsburg Monarchy, the Austrian Empire and the Austria-Hungary. Since 1918/1921, the region was divided between Hungary and the Kingdom of Serbs, Croats and Slovenes (later known as Yugoslavia).

Baranya may refer to:

Region is most commonly found as a term used in terrestrial and astrophysics sciences also an area, notably among the different sub-disciplines of geography, studied by regional geographers. Regions consist of subregions that contain clusters of like areas that are distinctive by their uniformity of description based on a range of statistical data, for example demographic, and locales. In astrophysics some regions have science-specific terms such as galactic clusters.

In Geography, regions can be broadly divided by physical characteristics (physical geography), human impact characteristics (human geography), and the interaction of Humanity and the environment (environmental geography). Geographic regions and subregions are mostly described by their imprecisely defined, and sometimes transitory boundaries, except in human geography where jurisdiction areas such as national borders are clearly defined in law.

Apart from the global continental regions, there are also hydrospheric and atmospheric regions that cover the oceans, and discrete climates above the land and water masses of the planet. The land and water global regions are divided into subregions geographically bounded by large geological features that influence large-scale ecologies, such as plains and steppes, forested massifs, deserts, or mountainous regions. Subregions describe the areas within regions that are easily distinguished in both the geological and ecological observable features.