Holy war may refer to:

• a Religious war justified by religious differences.

• The Cherem referred to in the Tanakh.
• Crusades
• French Wars of Religion
• Jihad, a duty for Muslims which has different meanings.
• Reconquista
• Seisen, the name given by Showa era propaganda to the Second Sino-Japanese War, based on the hakko ichiu.
• Thirty Years War

• Holy War: The Crusades and their Impact on Today's World, a book by Karen Armstrong
• Holy Wars, a drawn-out flame war that may last years or even span careers.
• Holy War (Villanova vs. St. Joe's), the annual college basketball rivalry between two Philadelphia-area schools, Saint Joseph's University and Villanova University.
• Holy War (Utah vs. BYU), an annual college football game matching Utah in-state rivals BYU and the University of Utah.
• Holy War (Tri-unity vs. potters house), a High school rivalry played between Tri-unity and the Potter's House.
• "Holy Wars... The Punishment Due", a song written by Megadeth on their 1990 album Rust in Peace.
• Svyaschennaya Voyna (The Sacred War), a song written on the day after the Nazi invasion of the USSR
• In the case of professional sports, when an athlete plays against his former team.

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