Zvornik is a city in Republika Srpska, Bosnia and Herzegovina. In 2013, it had a population of 58,856 inhabitants. Zvornik is located on the Drina River, on the eastern slopes of Majevica mountain, at the altitude of 146m.

The town of Mali Zvornik ("Little Zvornik") lies directly across the river in Serbia. Kula Grad, a village that is part of Zvornik municipality, has a Middle Age fort, Zvornik fortress, built in the 12th century.

Zvornik is first mentioned in 1410, although it was known as Zvonik ("bell tower") at that time. The town's geographic location has made it an important trade link between Bosnia and the east. For instance, the main road connecting Sarajevo and Belgrade runs through the city. The medieval fort known as Kula grad was built in the early 7th century and still stands on the Mladevac mountainous range overlooking the Drina Valley.

During the Ottoman period, Zvornik was the capital of the Sanjak of Zvornik (an administrative region) within the Eyalet of Bosnia. This was primarily the case because of the city's crucial role in the economy and the strategic importance of the city's location. The Sanjak of Zvornik was one of six Ottoman sanjaks with most developed shipbuilding (besides the sanjaks of Vidin, Nicopolis, Požega, Smederevo and Mohac). In 1806, Zvornik was home to Mehmed-beg Kulenovic.

Stojan Cupic (also known as Zmaj od Nocaja), one of the leaders of the First Serbian Uprising, was captured and murdered by the Turks in Zvornik in 1815. He was initially buried near the road from Zvornik to Tuzla, and his remains were moved to Salaš Nocajski in 1988.

During the Bosnian War (1992–1995) Zvornik's Bosniak population was expelled. The military attack of paramilitary groups that came from Serbia on Zvornik Bosniaks commenced on 8 April 1992. During April 1992, many European news stations daily reported Serb armed attacks and mass killings of the Bosniak population of Zvornik and the surrounding villages.

On 19 May 1992, combined JNA, Serb paramilitary and Arkan's Tigers took control of Zvornik and Mali Zvornik. The suburbs of Karakaj and Celopek were places of prisons where hundreds of local Bosniaks were killed. The remaining Bosniaks and non-Serbs were relegated to concentration camps and detention facilities throughout the area. During the war Serb forces destroyed mosques in and around the city