Vojvodina (Serbian: Војводина, IPA: [vǒjvodina], VOY-və-DEE-nə), officially the Autonomous Province of Vojvodina (Serbian: Аутономна Покрајина Војводина, romanized: Autonomna Pokrajina Vojvodina), is an autonomous province in northern Serbia. It encompasses the historical and geographical regions of Bačka, Banat, Syrmia, and northernmost part of Mačva, lying to the north of the national capital Belgrade and the Sava and Danube rivers. Vojvodina has 1.7 million inhabitants, about a quarter of the country's population, and its administrative centre, Novi Sad, is the second largest city in Serbia.

Vojvodina is the Serbian word for voivodeship, a type of duchy overseen by a voivode. Its original historical name was Serbian Vojvodina ("Serbian Voivodeship"), a short-lived self-proclaimed autonomous province within the Austrian Empire. The Serbian Voivodeship, a precursor to modern Vojvodina, was an Austrian province from 1849 to 1860. The Serbian language uses two more varieties of the word Vojvodina. These varieties are Vojvodovina (Војводовина), and Vojvodstvo (Војводство), the latter being an equivalent to the Polish word for province, województwo (voivodeship).

The official name, the Autonomous Province of Vojvodina, in the province's six official languages is:

In the Neolithic period, two important archaeological cultures flourished in this area: the Starčevo culture and the Vinča culture. Indo-European peoples first settled in the territory of present-day Vojvodina in 3200 BC. During the Eneolithic period, the Bronze Age and the Iron Age, several Indo-European archaeological cultures were centered in or around Vojvodina, including the Vučedol culture, the Vatin culture, and the Bosut culture, among others.

Before the Roman conquest in the 1st century BC, Indo-European peoples of Illyrian, Thracian, and Celtic origin inhabited this area. The first states organized in this area were the Celtic State of the Scordisci (3rd century BC-1st century AD) with capital in Singidunum (modern-day Belgrade), and the Dacian Kingdom of Burebista (1st century BC).

During Roman rule, Sirmium (modern-day Sremska Mitrovica) was one of the four capital cities of the Roman Empire, and six Roman Emperors were born in this city or in its surroundings. The city was also the capital of several Roman administrative units, including Pannonia Inferior, Pannonia Secunda, the Diocese of Pannonia, and the Praetorian prefecture of Illyricum.

Roman rule lasted until the 5th century, after which the region came into the possession of various peoples and states. While Banat was a part of the Roman province of Dacia, Syrmia belonged to the Roman province of Pannonia. Bačka was not part of the Roman Empire and was populated and ruled by Sarmatian Iazyges.

After the Romans were driven away from this region, various Indo-European and Turkic peoples and states ruled in the area. These peoples included Goths, Sarmatians, Huns, Gepids, and Avars. For regional history, the largest in importance was a Gepid state, which had its capital in Sirmium. According to the 7th-century Miracles of Saint Demetrius, Avars gave the region of Syrmia to a Bulgar leader named Kuber circa 680. The Bulgars of Kuber moved south with Maurus to Macedonia where they co-operated with Tervel in the 8th century. Slavs settled today's Vojvodina in the 6th and 7th centuries, before some of them crossed the rivers Sava and Danube and settled in the Balkans. Slavic tribes that lived in the territory of present-day Vojvodina included Obotrites, Severians, Braničevci, and Timočani.