"This Means War" is a song recorded by Canadian pop rock group Marianas Trench for their fourth studio album, Astoria (2015).

[2] "This Means War" is about the absence of emotion that follows a break up, and how sometimes people would rather fight than feeling nothing; as Ramsay sings in the chorus, "I'd rather be a riot than indifferent.

[7] An accompanying music video was filmed in Los Angeles, California in the spring of 2016 and was directed by Anthony Chirco.

[9] Inspired by the musical West Side Story, the video depicts the band competing in a territorial "dance battle" with a rival gang.

[3][10][11] Ramsay explained the video's premise in the following statement: "Put on your leather, stretch your hamstrings and grab your can of paint!