Quedlinburg (German pronunciation: [ˈkveːtlɪnbʊʁk] ^ⓘ) is a town situated just north of the Harz mountains, in the district of Harz in the west of Saxony-Anhalt, Germany. As an influential and prosperous trading centre during the early Middle Ages, Quedlinburg became a center of influence under the Ottonian dynasty in the 10th and 11th centuries. The castle, church and old town with around 2,100 timber houses, dating from this time of influence, were added to the UNESCO World Heritage List in 1994 because of their exceptional preservation and outstanding Romanesque architecture.

Quedlinburg has a population of more than 24,000. The town was the capital of the district of Quedlinburg until 2007, when the district was dissolved. Several locations in the town are designated stops along a scenic holiday route, the Romanesque Road.

The town of Quedlinburg is known to have existed since at least the early 9th century, when there was a settlement known as Gross Orden on the eastern bank of the River Bode. It was first mentioned as a town in 922 as part of a donation by King Henry the Fowler (Heinrich der Vogler). The records of this donation were held by the abbey of Corvey.

According to legend, Henry had been offered the German crown at Quedlinburg in 919 by Franconian nobles, giving rise to the town being called the "cradle of the German Reich".

After Henry's death in 936, his widow Saint Matilda founded a religious community for women (Frauenstift) on the castle hill, where daughters of the higher nobility were educated. The main task of this collegiate foundation, Quedlinburg Abbey, was to pray for the memory of King Henry and the rulers who came after him. The Annals of Quedlinburg were also compiled there. The first abbess was Matilda, a granddaughter of King Henry and St. Matilda.

The Quedlinburg castle complex, founded by King Henry I and built up by Emperor Otto I in 936, was an imperial Pfalz of the Saxon emperors. The Pfalz, including the male convent, was in the valley, where today the Roman Catholic Church of St. Wiperti is situated, while the women's convent was located on the castle hill.

In 973, shortly before the death of Emperor Otto I, a Reichstag (Imperial Convention) was held at the imperial court in which Mieszko, duke of Polans, and Boleslav, duke of Bohemia, as well as numerous other nobles from as far away as Byzantium and Bulgaria, gathered to pay homage to the emperor. On the occasion, Otto the Great introduced his new daughter-in-law Theophanu, a Byzantine princess whose marriage to Otto II brought hope for recognition and continued peace between the rulers of the Eastern and Western empires.

In 994, Otto III granted the right of market, tax, and coining, and established the first market place to the north of the castle hill.