"Must of Got Lost" is a rock song by the American rock group The J. Geils Band. Released in 1974, the single reached No. 12 the following year. AllMusic critic Joe Viglione described it as "one of the most memorable tunes by The J. Geils Band." A live version of the song, with an extended spoken-word introduction by Peter Wolf, appears on Blow Your Face Out, J. Geils Band's second live album. The live version receives considerable airplay on album-oriented rock format stations.