Montenegro ( (listen); Montenegrin: Crna Gora, Црна Гора, lit. 'Black Mountain') is a country in Southeastern Europe. It is a part of the Balkans and is bordered by Bosnia and Herzegovina to the north, Serbia to the northeast, Kosovo to the east, Albania to the southeast, Croatia to the northwest, and the Adriatic Sea to the west with a coastline of 293.5 km. Podgorica, the capital and largest city, covers 10.4% of Montenegro's territory of 13,812 square kilometres (5,333 sq mi), and is home to roughly 31% of its total population of 621,000. Cetinje is the former royal capital (Montenegrin: prijestonica) of Montenegro and is the location of several national institutions, including the official residence of the president of Montenegro.

During the Early Medieval period, three principalities were located on the territory of modern-day Montenegro: Duklja, roughly corresponding to the southern half; Travunia, the west; and Rascia proper, the north. The Principality of Zeta emerged in the 14th and 15th centuries. From the late 14th century to the late 18th century, large parts of southern Montenegro were ruled by the Venetian Republic and incorporated into Venetian Albania. The name Montenegro was first used to refer to the country in the late 15th century. After falling under Ottoman Empire rule, Montenegro gained its semi-autonomy in 1696 under the rule of the House of Petrović-Njegoš, first as a theocracy and later as a secular principality. Montenegro's independence was recognised by the Great Powers at the Congress of Berlin in 1878. In 1910, the country became a kingdom.

After World War I, the kingdom became part of Yugoslavia. Following the breakup of Yugoslavia, the republics of Serbia and Montenegro together proclaimed a federation. Following an independence referendum held in May 2006, Montenegro declared its independence in June 2006 and the confederation dissolved.

Montenegro has an upper-middle-income economy and ranks 48th in the Human Development Index. It is a member of the United Nations, NATO, the World Trade Organization, the Organization for Security and Co-operation in Europe, the Council of Europe, and the Central European Free Trade Agreement. Montenegro is also a founding member of the Union for the Mediterranean, and is currently in the process of joining the European Union.