The Territorial Defence Force of the Republic of Bosnia and Hercegovina (Bosnian: Teritorijalna odbrana Republike Bosne i Hercegovine (T.O.

BiH)) were the first official armed forces of the Republic of Bosnia and Herzegovina at the beginning of the Bosnian War.

The TO was the official army of Bosnia and Herzegovina, along with the separate Bosnian military forces formed by Sefer Halilović the Patriotic League (PL).

The TO, from 1991 to April 1992, absorbed all units of the PL and districts military formations into the TO, which was eventually transformed at the end of May 1992 into the Army of the Republic of Bosnia and Herzegovina.

At the end of April 1992, the TO was reorganized into four regions (Bihać, Sarajevo, Tuzla and Zenica) and two tactical groups that controlled TO, PL and newly formed brigades.