Bosnia and Herzegovina, often referred to as Bosnia-Herzegovina or simply Bosnia, is a country in Southeast Europe. Situated on the Balkan Peninsula, it borders Serbia to the east, Montenegro to the southeast, and Croatia to the north and southwest, with a 20-kilometre-long (12-mile) coast on the Adriatic Sea in the south. Bosnia has a moderate continental climate with hot summers and cold, snowy winters. Its geography is largely mountainous, particularly in the central and eastern regions, which are dominated by the Dinaric Alps. Herzegovina, the smaller, southern region, has a Mediterranean climate and is mostly mountainous. Sarajevo is the capital and the largest city.
The area has been inhabited since at least the Upper Palaeolithic, with permanent human settlement traced to the Neolithic cultures of Butmir, Kakanj, and Vučedol. After the arrival of the first Indo-Europeans, the area was populated by several Illyrian and Celtic civilisations. Most of modern Bosnia was incorporated into the Roman province of Dalmatia by the mid-first century BCE. The ancestors of the modern South Slavic peoples arrived between the sixth and ninth centuries. In the 12th century, the Banate of Bosnia was established as the first independent Bosnian polity. It gradually evolved and expanded into the Kingdom of Bosnia, which became the most powerful state in the western Balkans by the 14th century. The Ottoman Empire annexed the region in 1463 and introduced Islam. From the late 19th century until World War I, the country was under Austro-Hungarian rule. In the interwar period, Bosnia and Herzegovina was part of the Kingdom of Yugoslavia. After World War II, it was granted full republic status in the newly formed Socialist Federal Republic of Yugoslavia. In 1992, following the breakup of Yugoslavia, the republic proclaimed independence. This was followed by the Bosnian War, which lasted until late 1995 and ended with the signing of the Dayton Agreement.
Bosnia and Herzegovina has around 3.4 million inhabitants, composed chiefly of three main ethnic groups: Bosniaks, who form one half of the population, followed by Serbs at one-third and Croats at one-sixth; minorities include Jews, Roma, Albanians, Montenegrins, Ukrainians and Turks, who are among 17 recognized "national minorities". Bosnia and Herzegovina has a bicameral legislature and a presidency made up of one member from each of the three major ethnic groups (directorial system). The central government's power is minimal, as the country is largely decentralised; it consists of two highly autonomous "entities"—the Federation of Bosnia and Herzegovina and Republika Srpska—and a third unit, the Brčko District, nominally under joint control, albeit governed by its own local government.
Bosnia and Herzegovina is a developing country and an upper-middle income economy, dominated by industry and agriculture, followed by tourism and services; tourism has increased significantly in recent years. The country has a social security and universal healthcare system, while primary and secondary education is free. It is a member of the United Nations, Council of Europe, OSCE, CEFTA, and is also a founding member of the SEECP. Bosnia and Herzegovina has been an EU candidate country since 2022, and a NATO membership candidate since 2010.
The first preserved widely acknowledged mention of a form of the name "Bosnia" is in De Administrando Imperio, a politico-geographical handbook written by the Byzantine emperor Constantine VII in the mid-10th century (between 948 and 952) describing the 'small land' (χωρίον) in Greek of Bosona (Βοσώνα).
The name of the land is believed to derive from the name of the river Bosna that courses through the Bosnian heartland. According to philologist Anton Mayer, the name Bosna could derive from Illyrian *Bass-an-as, which in turn could derive from the Proto-Indo-European root *bʰegʷ-, meaning 'the running water'.
The name Herzegovina means 'herzog's [land]', and herzog derives from the German word for 'duke'. It originates from the title of a 15th-century Bosnian magnate, Stjepan Vukčić Kosača, who was "Herceg [Herzog] of Hum and the Coast" (1448). Hum (formerly called Zachlumia) was an early medieval principality that had been conquered by the Bosnian Banate in the first half of the 14th century. When the Ottomans took over administration of the region, they called it the Sanjak of Herzegovina (Hersek, هرسك). It was included within the Bosnia Eyalet until the formation of the short-lived Herzegovina Eyalet in the 1830s, which reemerged in the 1850s, after which the administrative region became commonly known as Bosnia and Herzegovina.
On initial proclamation of independence in 1992, the country's official name was the Republic of Bosnia and Herzegovina, but following the 1995 Dayton Agreement and the new constitution that accompanied it, the official name was changed to Bosnia and Herzegovina.
Bosnia has been inhabited since at least the Paleolithic era. Notably, the Badanj Cave near Stolac features one of the oldest known cave engravings, depicting an animal figure believed to be a horse, dating back to approximately 13,000 to 12,000 BC. During the Neolithic period, significant cultures such as the Butmir and Kakanj emerged along the Bosna River. The Butmir culture, flourishing around 5100 to 4500 BC, is renowned for its distinctive ceramics and anthropomorphic figurines. Excavations near Sarajevo have uncovered intricately decorated pottery and realistic human figurines from this culture.
From the 8th century BCE, Illyrian tribes evolved into kingdoms. The most notable Illyrian kingdoms and dynasties were those of Bardylis of the Dardani and of Agron of the Ardiaei who created the last and best-known Illyrian kingdom. Agron ruled over the Ardiaei and had extended his rule to other tribes as well. From the 7th century BCE, bronze was replaced by iron, after which only jewelry and art objects were still made out of bronze. Illyrian tribes, under the influence of Hallstatt cultures to the north, formed regional centers that were slightly different. Parts of Central Bosnia were inhabited by the Daesitiates tribe. The Iron Age Glasinac-Mati culture is associated with the Autariatae tribe.
A very important role in their life was the cult of the dead, which is seen in their careful burials and burial ceremonies, as well as the richness of their burial sites. In the 4th century BCE, the first invasion of Celts was recorded. They brought the technique of the pottery wheel, new types of fibulas (small clasps resembling a safety pin) and different bronze and iron belts. They passed through en route to Greece.
In the Neretva Delta in the south, there were important Hellenistic influences of the Illyrian Daors tribe. Their capital was Daorson in Ošanići near Stolac. Daorson, in the 4th century BCE, was surrounded by megalithic, 5 m high stonewalls (as large as those of Mycenae in Greece), composed of large trapezoid stone blocks. Daors made unique bronze coins and sculptures.
Conflict between the Illyrians and Romans started in 229 BCE, but Rome did not complete its annexation of the region until AD 9. It was precisely in modern-day Bosnia and Herzegovina that Rome fought one of the most difficult battles in its history since the Punic Wars, as described by the Roman historian Suetonius. This was the Roman campaign against Illyricum, known as Bellum Batonianum. The conflict arose after an attempt to recruit Illyrians, and a revolt spanned for four years (6–9 AD), after which they were subdued. In the Roman period, Latin-speaking settlers from the entire Roman Empire settled among the Illyrians, and Roman soldiers were encouraged to retire in the region.
Following the split of the Empire between 337 and 395 AD, Dalmatia and Pannonia became parts of the Western Roman Empire. The region was conquered by the Ostrogoths in 455 AD. It subsequently changed hands between the Alans and the Huns. By the 6th century, Emperor Justinian I had reconquered the area for the Byzantine Empire. Slavs overwhelmed the Balkans in the 6th and 7th centuries. Illyrian cultural traits were adopted by the South Slavs, as evidenced in certain customs and traditions, and placenames.