Siward may refer to:
- Siward, king of Götaland
- Siward (Abbot of Abingdon) (d. 1048), Bishop of St. Martins
- Siward, Earl of Northumbria (d. 1055), Anglo-Scandinavian earl of Northumbria (also portrayed as a character in Shakespeare's Macbeth)
- Siward (Bishop of Rochester) (d. 1075) Bishop of Rochester
- Siward Barn (fl. 1066 to 1087), English resistor to William the Conqueror
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