Hillin von Fallemanien (circa 1100 – 23 October 1169), also spelled Fallenmaigne or Falemagne, was the Archbishop of Trier from 1152. He was an imperialist and a partisan of Frederick Barbarossa against Pope Alexander III.
Hillin's familial origins trace back to Liège. He was educated in France and had connections to Bernard of Clairvaux, Hildegard von Bingen, and Elisabeth von Schönau. In 1130, he arrived in Trier and he took up direction of the cathedral school in 1142. Ten years later, he was the archbishop.
In the same year as his episcopal succession was Frederick Barbarossa elected king. Hillin supported his election and took part in the 1154 – 1155 expedition into Italy. During the imperial coronation in that latter year, Hillin acted as legate for Pope Adrian IV. Hillin resisted the Count Palatine Conrad, who supported the rights of the citizenry of Trier to create a commune. He supported Barbarossa and his antipope Victor IV in 1159. Victor made him legate for his support. In 1165, Hillin went over to the side of Alexander though.
To Hillin's credit can be attributed the eastern half of Trier Cathedral. Around 1160, he took to renovating the Festung Ehrenbreitstein: he augmented the archiepiscopal palace, deepened the moat, founded the pentagonal keep, and dug a cistern.
He died in Trier.