Arnold II of Horne (died 8 March 1389) served as Prince and Bishop of Liège from 1378 until his death in 1389.
After the death of bishop Jan van Virneburg in 1371, the cathedral chapter nominated its provost Zweder Uterlo as candidate for the bishopric, but the rest of the chapters supported the papal candidate Arnold van Horne, who as a result become bishop.
Bishop Arnold was forced to grant participation to the Utrecht burghers in the administration of the land, in the Landbrief (landletter) of 1375, after which they accepted new taxes in order to straighten out the financial status of the bishopric.
Bishop Arnold managed to keep the parties separate, but he was moved to the Bishopric of Liège in 1378 by Pope Urban VI.
However, the chapter at Liege had chosen someone else for the bishopric, and this candidate was supported by Antipope Clement VII.