"Lost Girl" is a song by British rock band the Troggs, written by lead singer Reg Presley (credited under his birth name R. M. Ball).

Released as the group's debut single in February 1966, backed by "The Yella in Me", it failed to chart in the UK but became a top-ten hit in Sweden in December of that year.

The former was a hard rock song which according to Ken Barnes largely revolves around Chris Britton's "wildest guitar work" along with a "psuedo-African" beat by drummer Ronnie Bond.

[8][9] Writing for New Musical Express, the critic Derek Johnson stated that the lyrics contrasted against the "fervent, frantic beat", noting that the song had an "explosive, underlying rumble".

[10] Following its release, "Lost Girl" would remain in relative obscurity, partly because the Troggs re-used the melody and drum pattern for the song "From Home", which appeared as the B-side of "Wild Thing".