Modriča (Cyrillic: Модрича) is a town and municipality in Republika Srpska, Bosnia and Herzegovina. Near it lie the towns of Šamac and Gradačac.

Grb Modrica

According to the 1991 census, the Modriča municipality had a population of 35,413 people, including:

• 12,563 Serbs (See: Serbs of Bosnia and Herzegovina)
• 10,442 Muslims by nationality
• 9,660 Croats (See: Croats of Bosnia and Herzegovina)
• 1,813 Yugoslavs
• 935 others

In town there was;

• Settlement: Mus Srbs Croats Yugos Others Sum M% S% C% Y% O%
• Modrica-1 1163 871 460 488 89 3071 38% 28% 15% 16% 3%
• Modrica-2 1782 945 378 373 116 3594 50% 26% 11% 10% 3%
• Modrica-3 880 497 232 350 64 2023 43% 25% 11% 17% 3%
• Modrica-4 1475 121 51 138 25 1810 81% 7% 3% 8% 1%

Muslims by nationality were majority in every part of the town.

Modrica on map BiH Population 35,413

Note: The overwhelming majority of those who considered themselves Muslims by nationality in 1991 today consider themselves Bosniaks.

In 2006, the majority of inhabitants of the municipality were ethnic Serbs.

The Modriča oil refinery is located in Modriča. Products include High quality motor oil Optima, Optima Supervisk, Optima Racing and Maxima. It have ISO:9001 Certificat of Quality (web site: www.modricaoil.com).