"Loser" is a song by Arjen Anthony Lucassen's progressive rock/metal opera Ayreon, originally released under the title "Day Sixteen: Loser" as a part of the 2004 album The Human Equation. It is the fifth track of the second disc, and the sixteenth track of the overall album. It was later released as the fifth single by Ayreon under the new title "Loser"; this version, very different, features several new musicians.