Modriča (Cyrillic: Модрича) is a city and municipality in Republika Srpska, Bosnia and Herzegovina. It is located near the towns of Šamac, Derventa and Doboj. After the war, prewar municipal borders were changed, villages of Jakeš, Pećnik and Modrički Lug were excluded from Modriča and included in new Vukosavlje municipality, and a few villages from the western part of prewar Gradačac municipality were included. So the area of municipality changed substantially.