Arnold II of Isenburg-Braunsberg (? - 5 November 1259) was the Archbishop of Trier from 1242 until 1259. Arnold was born as a son of Count Bruno II of Isenburg-Braunsberg and Theodora of Wied. In 1217 he became an archdeacon of the cathedral of Trier, and was made a cathedral provost in 1228. Arnold was elected the Archbishop of Trier in 1242. However the Emperor had appointed Rudolph of the Brücken as archbishop, and had granted him the regalia. A civil war between the two candidates ensued, and it was not until Rudolph renounced the archbishopric and Pope Innocent IV confirmed Arnold on 23 January 1245 that the fighting ceased.