"Waterloo" is the first single from the Swedish pop group ABBA's second album of the same name, and their first under the Epic and Atlantic labels. This was also the first single to be credited to the group performing under the name ABBA. The title and lyrics reference the 1815 Battle of Waterloo, and use it as a metaphor for a romantic relationship. The Swedish version of the single was backed with the Swedish version of "Honey, Honey", while the English version featured "Watch Out" on the B-side.