The first written document about Modriča is a 13th century charter of Hungarian King Bela IV in which Modriča is mentioned as a spring: "...fons Modricha, ubi cadit in Boznam ("...the spring of Modricha, where it falls into the Boznam")"; this indicates that it was a minor stream which was flowing into the Bosna river.

According to other narratives, the area bears the name of Old Slavic marks of the blue sky and distances, which are more discerned on the horizon than visible – modrina (blue/bruise-like)/modriča.

There is archaeological evidence of human presence in the territory of present-day Modriča municipality back in the Paleolithic — Old Stone Age.

After the defeat of the Turks at Vienna in 1683, Modriča was the border area the next two centuries, which meant it was a zone of conflicts, rebellions, devastation and economic stagnation.

[2] Modriča is twinned with: Una-Sana  Central Bosnia Posavina  Herzegovina-Neretva Tuzla  West Herzegovina Zenica-Doboj  Sarajevo Bosnian Podrinje Canton 10