William V of Montferrat
- Født: Omkr 1115
- Død: 1191 i en alder af ca. 76 år
 Notater:
William V of Montferrat (occ./piem. Guilhem, it. Guglielmo) (c. 1115 . 1191), also known as William the Old to distinguish him from his eldest son, William Longsword, was marquess of Montferrat from c. 1136 to his death in 1191. William was the only son of marquess Renier I and his wife Gisela, a daughter of William I, Count of Burgundy and widow of Count Humbert II of Savoy. It seems likely, given that he was still fit enough to participate in battle in 1187, that William was one of his parents' youngest children.
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