Seven Year War may refer to:
- Seven Years' War (1756–63), among European powers and their colonies, encompassing the French and Indian War
- Northern Seven Years' War (1563–70), also known as the Nordic Seven Years' War, Sweden against Denmark-Norway and allies
- Japanese invasions of Korea (1592–98), sometimes referred to in Korean as the "Seven Year war"
- Gunboat War (1807–14), Britain against Denmark and Norway, during the Napoleonic Wars
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