Kotor Varoš (Cyrillic: Котор Варош) is a town and municipality in northwestern Republika Srpska, Bosnia and Herzegovina.

The city was first mentioned in the 10th century, when it was called Kotor. Varoš, added later, means "town" in Hungarian (város). The town has great historic importance to Bosniaks, Bosnian Croats and Bosnian Serbs.

During the Bosnian War numerous religious and cultural monuments and landmarks were destroyed by various Serb paramilitary groups, such as the Croatian Roman Catholic Church in the centre of the town. Also notable destruction was found in the southern "Čarsija" region of the town where nearly every single house was destroyed. Bosnian Serb-dominated parts of the town were mainly unaffected by the conflict. It is also important to note that due to the proximity (38 km) of Kotor Varoš to Banja Luka and that the city's post-war population demographic percentages were strongly impacted by this.

• Baština • Bilice • Boljanići • Borci Donji • Borci Gornji • Ćorkovići • Duratovci • Garići • Grabovica • Hadrovci • Hrvaćani • Jakotina • Kotor Varoš • Kruševo Brdo I • Kruševo Brdo II • Liplje • Maljeva • Maslovare • Obodnik • Orahova • Palivuk • Plitska • Podbrđe • Podosoje • Postoje • Prisočka • Radohova • Ravne • Selačka • Sokoline • Stopan • Šibovi • Šiprage • Tovladić • Vagani • Varjače • Večići • Viševice • Vranić • Vrbanjci • Zabrđe i Zaselje.

Kotor (Montenegrin: Котор / Kotor, pronounced [kɔ̌tɔr]) is a coastal city in Montenegro. It is located in a secluded part of the Gulf of Kotor. The city has a population of 13,510 and is the administrative center of the municipality.

The old Mediterranean port of Kotor is surrounded by an impressive city wall built by the Republic of Venice and Venetian influence remains predominant in the city's architecture. The Bay of Kotor (Boka Kotorska; Bocche di Cattaro), one of the most indented parts of the Adriatic Sea, is sometimes called the southern-most fjord in Europe (though it is actually a submerged river canyon). Together with the nearly overhanging limestone cliffs of Orjen and Lovćen, Kotor and its surrounding area form an impressive and picturesque Mediterranean landscape.

In recent years, Kotor has seen a steady increase in tourists, many of them coming by cruise ship. Visitors are attracted both by the natural beauty of the Gulf of Kotor and by the old town of Kotor itself.

Kotor is part of the World Heritage Site dubbed the Natural and Culturo-Historical Region of Kotor.