Doboj (Bosnian: Doboj/Добој, Serbian: Добој) is a town in northern Bosnia, situated on the river Bosna.
Presently, a larger part of the city is part of the Republika Srpska (the DobojRegion), while the southern suburbs are part of the Zenica-Doboj Canton of Federation of Bosnia and Herzegovina, and the eastern subursbs are part of the Tuzla Canton.
The Doboj fort, first built in the early 13th century and expanded in the 15th century, fell to the Ottoman Empire in 1476, only to be expanded yet again in 1490.
The last Illyrian rebellion occurred in the Vareš region, and was crushed by Emperor Tiberius in nine C.E.
The region was conquered by the Ostrogoths in 455, and further exchanged hands between the Alans and Huns in the years to follow.
The major cities are the capital Sarajevo, Banja Luka in the northwest region known as Bosanska Krajina, Tuzla in the northeast and Mostar, the capital of Herzegovina.