Holy war

Holy war may refer to:

A religious war led with an exceptionally high grade of religious feeling
The Crusades, 11th, 12th, and 13th-century religiously sanctioned military campaigns waged by much of Christian Europe against the Muslim Middle East.
The Herem referred to in the Hebrew Bible.
Reconquista
Seisen, the name given by Showa era propaganda to the Second Sino-Japanese War, based on the slogan hakko ichiu.
Taiping Rebellion
Spread of Islam
Jewish–Roman wars
Arab-Israeli Wars
Way of the Celestial Masters
Five Pecks of Rice Rebellion
Jihad (generally translated into English as "Holy War"), in Islam
Wars of Religion (France)
Wars of Religion

Sports

Holy War (Boston College vs. Notre Dame), a football rivalry between Boston College and Notre Dame
Holy War (Utah vs. BYU), between Brigham Young University and the University of Utah
Traditional rivalry between Kraków's two major football clubs, Cracovia and Wisła
The charity bowl game between the two San Diego Catholic high schools, University of San Diego High School and St. Augustine High School for football
Saint Ignatius High School (Cleveland) versus St. Edward High School (Lakewood, Ohio) for basketball
Holy War (Villanova vs. St. Joe's), the Philadelphia Big 5 rivalry game between Villanova University and Saint Joseph's University

"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
The Holy War, a 1682 novel by John Bunyan
Holy Wars (film), 2010 documentary film
Seisen no Keifu Genealogy of the Holy War a Fire Emblem videogame
Holy War (album), the second album released by the power metal band Dragonland
Holy War, Batman!
Holy War, Inc., a 2001 book by CNN investigative journalist and documentarian Peter Bergen