According to the written documents, Gradiska was first mentioned a little more than 700 years ago under the name of Gradiski Brod. However, the life in the area of the present town, its immediate and wider environs, dates back to the prehistoric times.

In the Roman times, there was a settlement called Municipium Servicium in the area of the present town, which was an important crossroad between the east and the south of the Balkans, i.e. a port for the Roman river fleet, which speaks for itself about the strategic importance of the settlement at the time.

Around 1330. Gradiska was mentioned as a free town. In the Middle Ages, Gradiska had a major importance as the place where the Sava river used to be crossed. In 1537, this place fell under the rule of the Ottomans who stayed in these regions until the annexation of Bosnia and Herzegovina by Austria-Hungary in 1878. In these regions the Serbian people have never reconciled themselves to the violence and injustice. They organized uprisings against the Ottomans and other conquerors, successfully resisted the enemy and came out of all the wars as the victors.

The people of this region who lived to see the end of the Second World War found themselves in looted places and deserted hearths. At battlefields and the death camps in Jasenovac, Stara Gradiska, Jastrebarsko, and other places of torture, some 13,000 Serbs lost their lives among them about 4,500 children below fifteen years of age.

In the last War for the Fatherland the Serbian people have managed to protect their territories in this region and to preserve the material resources. Defending their people, their national interests, and identity, 300 fighters from the territory of this Municipality built their lives into the foundations of the Republic Srpska.