Burgenland (Austrian German pronunciation: [ˈbʊrɡn̩land] ^ⓘ; Hungarian: Őrvidék; Croatian: Gradišće; Austro-Bavarian: Burgnland; Slovene: Gradiščanska; Slovak: Hradsko) is the easternmost and least populous state of Austria. It consists of two statutory cities and seven rural districts, with a total of 171 municipalities. It is 166 km (103 mi) long from north to south but much narrower from west to east (5 km or 3 mi wide at Sieggraben). The region is part of the Centrope Project. The name of Burgenland was invented/coined in 1922, after its territories became part of Austria. The population of Burgenland as of 1 January 2024 is 301,951. Burgenland's capital is Eisenstadt.

The territory of present-day Burgenland was successively part of the Roman Empire, the Hun Empire, the Kingdom of the Ostrogoths, the Italian Kingdom of Odoacer, the Kingdom of the Lombards, the Avar Khaganate, the Frankish Empire, Dominion Aba belonging to the Aba (family); Aba – Koszegi, the Kingdom of Hungary, the Habsburg monarchy, the Austrian Empire, Austria-Hungary, and lastly Austria.

Burgenland is the only Austrian province which has never been part of the Archduchy of Austria, Holy Roman Empire, German Confederation nor Austria-Hungary's Cisleithania.

From the 4th century BC, the area was dominated by Celts and in the 1st century AD it became part of the Roman Empire. During Roman administration, it was part of the province of Pannonia, and later part of the provinces of Pannonia Superior (in the 2nd century) and Pannonia Prima (in the 3rd century). During the late Roman Empire, Pannonia Prima province was part of larger administrative units, such are Diocese of Pannonia, Praetorian prefecture of Illyricum and Praetorian prefecture of Italy.

The first Germanic people to settle in this region were the Ostrogoths, who came to Pannonia in AD 380. The Ostrogoths became allies of Rome and were allowed to settle in Pannonia, being tasked to defend the Roman borders. In the 5th century, the area was conquered by the Huns, but after their defeat, an independent Kingdom of the Ostrogoths in Pannonia was formed. The territory of present-day Burgenland became part of the Italian Kingdom of Odoacer, but at the end of the 5th century the Ostrogothic king Theodoric conquered this kingdom and restored Ostrogothic administration in western Pannonia.

In the 6th century, the territory was included in another Germanic state, the Kingdom of the Lombards. However, the Lombards subsequently left towards Italy and the area came under the control of the Avars. For a brief period in the 7th century, the area became part of the Slavic State of Samo, however it subsequently came back under Avar control. After the Avar defeat at the end of the 8th century, the area became part of the Frankish Empire. After the Battle of Lechfeld (or Augsburg) in 955, new Germanic settlers came to the area.

In 1043, Henry III and King Samuel Aba of Hungary signed a peace treaty. On 20 September 1058, Agnes of Poitou and Andrew I of Hungary met to negotiate the border. The area of Burgenland remained the western frontier of the medieval Kingdom of Hungary until the 16th century.

The majority of the population was Germanic, except for the Hungarian border guards of the frontier March (Gyepű). Germanic immigration from neighbouring Austria was also continuous in the Middle Ages.