Adalberon of Munsterol (also called Adalberon of Montreuil; c. 1080 - 18 January 1152) was the Archbishop of Trier from 1131 until 1152.

After the death of Meginher of Vianden in Parma in 1130, the Cathedral chapter elected Bruno of Berg the next archbishop. Bruno, however, refused and was soon elected the Archbishop of Cologne instead. On 19 April 1131 Adalberon, formerly the Primate of the church in Metz, was finally elected the new archbishop. Adalberon, born in the peasantry in the Bishopric of Toul, was an opponent of lay investiture thus only begrudgingly did King Lothar grant the regalia and he accept.

Adalberon, being a commoner, found himself opposed by the aristocracy of the see upon his ascension, so the early years of his reign was marked by warfare. He humiliated and defeated the church steward Burgrave Louis, who had controlled the former Archbishop, and moved the residence of the archbishop to remove all influence. In 1136 he sent knights to the Imperial army of Lothar, and the following year had Conrad of Hohenstauffen elected Holy Roman Emperor. On 13 March 1138 he crowned Conrad king of Germany in Aachen, and it was only through Adalberon's support that Conrad defeated other claimants to the throne.

His attempts to bring the immediate Abbey of St Maximin failed as the Pope confirmed its immediacy and jurisdiction in 1140. In 1147 he inaugurated the famous Abbey of St Matthias. In 1148 Pope Eugene III granted Adalberon the seat of honour, and confirmed Trier's primatial see over the church in modern Belgium and eastern France. In 1152 he travelled to Coblenz to reconcile a controversy between the Count of Sayn and Molbach, because of the adverse effect it would have on Coblenz]], when he died. He was buried in Trier Cathedral.

Adalberon, after Baldwin of Luxembourg, stands as the second greatest and most influential archbishop of Trevorian history.

Preceded by:

Adalberon of Munsterol

Succeeded by:

Meginher of Vianden Archbishop of Trier
1131 - 1152
Hillin of Fallemanien