Not in Love (Crystal Castles song)

"Not in Love" is a song recorded by the Canadian electronic music duo Crystal Castles. It is a cover of the 1983 single by the Canadian rock band Platinum Blonde. A first version appeared on Crystal Castles' second studio album, Crystal Castles (2010), with vocals from the member Ethan Kath. Following the album's release, Robert Smith of the Cure asked for permission to remix one of its tracks. Kath instead asked Smith to record his own vocals, which were used in a remix that was digitally released as a non-album single on October 26, 2010, alongside a music video.

Critics stated the first version of "Not in Love", which is a synth-pop song, is calmer than Smith's version, which is a gothic rock song and has stronger beats and synthesizers. Although critics generally described the album version as unexciting, they praised Smith's cover, especially its vocals, and some publications named it one of the best songs of 2010. The Smith cover appeared in the singles charts of Australia, Denmark, Scotland, and the United Kingdom, and was certified gold by Music Canada.