Hilduin (or Hildwin, Hilduinus, etc.) may refer to:

• Hilduin (bishop of Verdun) [ru] (died 847)
• Hilduin (archbishop of Cologne) [de] (died 849)
• Hilduin of Saint-Denis (died 855/9), abbot, archchaplain and bishop
• Hilduin of Saint-Martin [fr] (died 860), abbot
• Hilduin of Saint-Germain-des-Prés (fl. 854–867), abbot, archchaplain and bishop
• Hilduin (bishop of Évreux) [ru] (died 870)
• Hilduin of Saint-Bertin [fr] (died 877), abbot
• Hilduin (archbishop of Milan) [ru; it; de] (died 936), also bishop of Liège and Verona
• Hilduin I, Count of Montdidier (died before 956)
• Hilduin II, Count of Arcis-sur-Aube (died after 993)
• Hilduin (bishop of Limoges) (r. 990–1012)
• Hilduin III, Count of Montdidier (died after 1032)
• Hilduin of Joinville [fr] (died 1055), lord of Nully
• Hilduin IV, Count of Montdidier (died 1063)
• Hilduin of Vendeuvre [fr] (died 1203), bishop of Langres