Lost Song may refer to:
Lost Song (TV series), a 2018 Japanese anime series Lost Song (film), a 2008 Canadian film Sword Art Online: Lost Song, a 2015 Japanese video game "The Lost Song", a 2003 song by the Cat Empire from their self-titled debut Lostwave, a genre of songs with little to no information available about their origins, often dubbed "lost"
See also Lost Songs (disambiguation) Lost (disambiguation), for songs named "Lost"