This Means War may refer to:

• A repeated line in the Groucho Marx film Duck Soup
• A catchphrase of Bugs Bunny
• This Means War (film), a 2012 American action spy film starring Reese Witherspoon, Chris Pine, and Tom Hardy

• This Means War (Attack Attack! album)
• This Means War!, an album by Petra
• This Means War (Tank album)

• "This Means War", a song by AC/DC on the album Blow Up Your Video
• "This Means War" (Avenged Sevenfold song)
• "This Means War" (Marianas Trench song)
• "This Means War" (Nickelback song)
• "This Means War," a song by Joan Jett from her album Good Music (1986) and the soundtrack for the film Light of Day (1987)
• "This Means War!!" (featuring Ozzy Osbourne), a song by Busta Rhymes from his album E.L.E. (Extinction Level Event): The Final World Front (1998)

This disambiguation page lists articles associated with the title This Means War.
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