Castilian War may refer to:
- Castilian war of succession (1282–1304) between Sancho IV of Castile and the Infantes de la Cerda
- Castilian Civil War (1351–1369) between Peter of Castile and Henry II of Castile
- War of the Two Peters (1356–1375) between Peter of Castile and Peter IV of Aragon
- War of the Castilian Succession, or Castilian War of Succession (1475–1479) between Isabella I of Castile and Joanna la Beltraneja
- Revolt of the Comuneros, or Castilian War of the Communities (1520–1) between Castilian Comuneros rebels and Castilian Royalists
- Castilian War, or Spanish Expedition to Borneo (1578) between the Spanish Empire and the Bruneian Empire
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