Barons' War may refer to:
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First Barons' War
The First Barons' War (1215–1217) was a civil war in the Kingdom of England in which a group of rebellious major landowners (commonly referred to as barons) led by Robert Fitzwalter waged war against King John of England. The conflict resulte ...
(1215–1217) in England during the reign of John
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Second Barons' War
The Second Barons' War (1264–1267) was a civil war in England between the forces of a number of barons led by Simon de Montfort against the royalist forces of King Henry III, led initially by the king himself and later by his son, the fu ...
(1264–1267) in England during the reign of Henry III
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