"When Love & Hate Collide" is a power ballad by British rock band Def Leppard from their 1995 greatest hits album Vault, written by Joe Elliott and Rick Savage. It was originally written and demoed for Adrenalize, but not finalized until 1995 for its inclusion on Vault. The demo version is much more heavily produced in the signature style of Hysteria and Adrenalize, and the final version is more stripped down, supposedly toward the style of the following studio album Slang.