"Enemy" is a song by Days of the New and the lead single from their second eponymous album also known as "Green." The song reached #2 on Billboard's Mainstream Rock Tracks in 1999 and #10 on the Modern Rock Tracks the same year, becoming only their second song to hit the Top 10 on this chart. "Enemy" also serves as the ninth track on The Definitive Collection, released in 2008.

"Enemy" is a prime example of Travis Meeks' shift into new musical scape on "Green"; whereas the first album established a moderately stripped down acoustic rock style, "Enemy" incorporates classical strings as well as electronic effects and percussion comparable to that heard in dance club music. Regarding this decision, Meeks said, "It was an experiment. It was something that I wanted to try - just like putting red in a painting instead of using more blue, just trying something different."Acoustic guitar remains well implemented, however, and an echoed horn is also heard during the chorus. Vocal layering occurs throughout "Enemy" as well with clean singing in the foreground and a distant, hollower voice providing backup vocals. The song fades to silence as it nears the end. A moody acoustic guitar then enters which is soon accompanied by a lead guitar solo before slowly fading out together.

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