This is a list of the bishops and prince-bishops of Liège. It includes the bishops of the Roman Catholic Diocese of Liège and its predecessor see of Tongeren and Maastricht. From 972 to 1795, the bishops of Liège also ruled a lordship (not co-existensive with their diocese) known as the Prince-Bishopric of Liège.

The Prince-Bishopric of Liège was a state of the Holy Roman Empire in the Low Countries, situated for the most part in present Belgium, which was ruled by the Bishop of Liège who held an Imperial Estate and had seat and voice at the Imperial Diet. The Prince-Bishopric of Liège should not be confused with the diocese of Liège, which was larger.