Siward
Siward may refer to:
- Synardus or Siward, king of Götaland
- Siward (Abbot of Abingdon), Bishop of St. Martins
- Siward, Earl of Northumbria, Anglo-Scandinavian earl of Northumbria
- Siward (bishop of Rochester) Bishop of Rochester
- Siward Barn, English resistor to William the Conqueror
- Richard Siward, 13th-century soldier
- Young Siward, a character in William Shakespeare's play Macbeth
- Siward, king of Norway, a probably fictional figure in the Gesta Danorum; see Lagertha