"Bittersweet" is a single by the cello rock band Apocalyptica in collaboration with Ville Valo and Lauri Ylönen. The music is by Apocalyptica, the lyrics by Ville Valo and the vocals by Ville Valo and Lauri Ylönen. The song is written for four cellos (quartet) and voice, but there are versions for just the cello quartet. The lyrics are about a love triangle, in which a woman loves a man, who does not love her back, and another man who is in love with the woman, while she does not love him back.

Ville Hermanni Valo is a Finnish singer, songwriter and musician. He is best known as the lead vocalist of the gothic rock band HIM.