Arnold I of Vaucourt (French: Arnaud, Arnaut de Vaucort, German: Arnold von Valcourt, Valancourt, Walecourt) (circa 1120 – May 25, 1183 in Trier), was the Archbishop of Trier from 1169 to 1183. He took a pro-Imperial position in the Investiture Controversy of the twelfth century. As archbishop, Arnold was accounted a capable ruler, by turns thrifty and generous, with a genuine concern for his church and his domain. Upon Arnold's death in Trier in May 1183, the succession to the Archbishopric fell into dispute between Folmar of Karden and Rudolf of Wied.