Lothar von Hochstaden (died 1194 in Rome) was Bishop of Liège and archchancellor.
He was provost of St. Cassius in Bonn and St. Servatius in Maastricht, and dean of St. Lambertus in Liège.
In January 1192 the Emperor Henry VI made him archchancellor and bishop of Liège, where there had recently been a contentious election in which both parties were supported by various Flemish nobles.
The originally chosen bishop, Albert of Leuven, a brother of Henry of Brabant, obtained from the Pope Celestine III confirming his episcopal dignity and was consecrated September 19, 1192 to Reims.
Then, leaning on Henry VI, Lothar and Baldwin took action against Albert, who was killed on 24 November in front of German knights of Reims.