Unholy Alliance

Unholy Alliance may refer to:

• Unholy Alliance (geopolitical), when political antagonists temporarily join together to fight a common enemy
  • Unholy Alliance (Sierra Leone), an alliance of militia groups in the Sierra Leone Civil War
• The Unholy Alliance (ECW), an Extreme Championship Wrestling tag team
• The Unholy Alliance Tour, an annual heavy metal tour
• "Unholy Alliance", Parts One and Two, episodes of Highlander: The Series
• The Unholy Alliance (WWF), Undertaker and The Big Show's World Wrestling Federation tag team.

In literature:

• Unholy Alliance, a book by David Yallop
• Unholy Alliance: A History of Nazi Involvement with the Occult, a book by Peter Levenda
• Unholy Alliance: Radical Islam and the American Left, a book by David Horowitz
• Unholy Alliance: Religion and Atrocity in Our Time, a book by Marc H. Ellis
• An Unholy Alliance, a novel by Susanna Gregory
• Unholy Alliance, a supervillain team from the comic book series Astro City