"Bad Girl" is a song by the American garage rock band the Zakary Thaks, written by the whole group -- Chris Gerniottis, Pete Stinson, Stan Moore, Rex Gregory, and John Lopez -- and was first released for the band's debut single on J-Beck Records in July 1966 (see 1966 in music). The song was an immensely successful regional hit in Texas, precipitating "Bad Girl"'s national release on Mercury Records later in the year. Since its initial distribution, the tune has received further recognition for its appearance on several compilation albums.

Forming in early 1966, the Zakary Thaks rose to prominence in Corpus Christi, Texas, becoming a popular fixture, and rival to fellow group the Bad Seeds, while performing in the music venue known as the Carousel Club. The band members collectively adopted their moniker for sounding distinctively British, thereby symbolizing the group's alignment with the British Invasion, particularly the Kinks, the Yardbirds, and the Rolling Stones. The Zakary Thaks' R&B-influenced musical stance and assortment of original material appealed to record producer and Bad Seeds manager Carl Becker, who signed the band to his record label J-Beck.

Entering Jimmy Nicholls’ (who owned the local Pharaoh Records label, releasing material by several other Texas musical acts) studio in McAllen, Texas along with the Bad Seeds, the Zakary Thaks recorded "Bad Girl", for all intents and purposes as a live number on a basic two-track tape. All five members collaborated to pen the song, which was coupled with their compelling cover version of the Kinks' "I Need You". For lead vocalist Chris Gerniottis, "Bad Girl" was "like the one true picture of what the Zakary Thaks were as a group". Indeed, the composition reflects upon the group's adolescent sound inspired by early-Kinks music, though Gerniottis's bluesy vocals are remarkably mature given that he was only 15-years-old at the time of the song's recording. Musically, "Bad Girl" is also highlighted by Stan Moore's frantic drumming, and lead guitarist John Lopez's double-time guitar break, assembling one of the best examples of the musical genre of garage rock.

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