Quedlinburg Abbey was a house of secular canonesses (Frauenstift) in Quedlinburg in what is now Saxony-Anhalt, Germany. It was founded in 936 on the initiative of Saint Mathilda, the widow of the East Frankish King Henry the Fowler, as his memorial. For many centuries it and its abbesses enjoyed great prestige and influence. Quedlinburg Abbey was an Imperial Estate and one of the approximately forty self-ruling Imperial Abbeys of the Holy Roman Empire. It was disestablished in 1802/3. The church, known as Stiftskirche St Servatius, is now used by the Lutheran Evangelical Church in Germany.

Princely abbeys and Imperial abbeys were religious establishments within the Holy Roman Empire which enjoyed the status of imperial immediacy (Reichsunmittelbarkeit) and therefore were answerable directly to the Emperor. The possession of imperial immediacy came with a unique form of territorial authority known as Landeshoheit, which carried with it nearly all the attributes of sovereignty.