Dobruja (also spelled Dobrudja; Bulgarian: Добруджа, Dobrudzha; Romanian: Dobrogea pronounced [ˈdobrod͡ʒe̯a] or [doˈbrod͡ʒe̯a]; Turkish: Dobruca) is a historical region shared by Bulgaria and Romania, located between the lower Danube river and the Black Sea, including the Danube Delta, Romanian coast and the northernmost part of the Bulgarian coast. The territory of Dobruja comprises Northern Dobruja, which is part of Romania, and Southern Dobruja, which belongs to Bulgaria.

The territory of the Romanian region Dobrogea is now organised as the counties of Constanţa and Tulcea, with a combined area of 15,500 km² and a population of slightly less than a million. Its main cities are Constanţa, Tulcea, Medgidia and Mangalia. Dobrogea is represented by dolphins in the coat of arms of Romania. The Bulgarian region of Dobrudzha is divided between the administrative regions of Dobrich and Silistra. This part has a total area of 7,565 km², with a combined population of some 350,000 people, the main towns being Dobrich and Silistra (regional seats).