Born Under a Bad Sign is the second studio album by American blues musician Albert King, released in August 1967 by Stax Records. It features eleven electric blues songs that were recorded from March 1966 to June 1967, throughout five different sessions. King played with Booker T. & the M.G.'s and the Memphis Horns for these recording sessions. Although the album failed to reach any music chart, it did receive positive reviews from music critics and is often cited as one of the greatest blues albums ever made. Born Under a Bad Sign influenced many guitarists, including Eric Clapton, Mike Bloomfield, Jimi Hendrix, and Stevie Ray Vaughan. Born Under a Bad Sign has been recognized by several music institutions, and has been inducted into the Blues Foundation Hall of Fame, the Grammy Hall of Fame, and the National Recording Registry.

In 1966, King signed with the Memphis-based label Stax Records. The 43-year-old musician had already recorded music for other labels, but outside of his 1961 song "Don't Throw Your Love on Me So Strong", he had yet to find any commercial success. Throughout five sessions from March 1966 to June 1967, King recorded several songs at Stax Studios with the in-house band Booker T. & the M.G.'s with the Memphis Horns. Although Jim Stewart is credited as the producer, trumpeter Wayne Jackson said Steve Cropper and Al Jackson Jr. ran the recording sessions. Many of the songs recorded during these sessions were released as singles, and in August 1967, the singles were compiled and released as King's debut album with Stax, titled Born Under a Bad Sign.

Born Under a Bad Sign is an electric blues album, with influences of soul and funk. The album's music comprises simple chord progressions, which Jackson noted was due to inexperience. "We didn't know how to play it any better!" said Jackson. King played primarily on the three highest guitar strings and only used a select few phrases throughout the album. In the liner notes for the 2002 reissue of Born Under a Bad Sign, critic Michael Point wrote how King was able to distinguish his guitar play despite only using a few phrases: "His simple but subtle reconfigurations were accomplished through inflections, emphasis, and timing, not via sprinting through scales."

The sharp guitar sound heard throughout the album can be partially attributed to King's unorthodox style of playing. King was left-handed, but chose to play a right-handed Gibson Flying V and not restring it. King pulled strings from above instead of pushing from below, the standard string bending technique. As a result, he was able to bend several strings simultaneously, which allowed for multi-timbral phrasing. When asked about King's style of play, Jackson said: "Albert's guitar was always out of tune with everything else, but he was such a strong man he would just bend the notes back in!"

Side one of Born Under a Bad Sign features six short songs, which are all under three minutes long. Side two features longer, more ballad-like songs. "Personal Manager" in particular contains one of the few guitar solos on the album. Arguably the most famous song from Born Under a Bad Sign is the album's title track, which was written by William Bell and Booker T. Jones. Bell wanted to write a song about astrology and came up with an unconventional ten-bar guitar line (as opposed to eight-bar and twelve-bar blues) during a jam session. Music historian Rob Bowman called "Born Under a Bad Sign" "one of the most smokingly intense blues recordings of the modern era".

Born Under a Bad Sign was released in August 1967 by Stax Records. It failed to reach any music chart, although three songs from the album—"Laundromat Blues" (1966), "Born Under a Bad Sign", and "Crosscut Saw" (both 1967)—did reach the Hot Rhythm & Blues Singles chart. Rob Bowman believes this was because the rhythm and blues market emphasized 45 rpm singles as opposed to albums. A critic from Billboard magazine awarded the album a "Special Merit Pick" label, and wrote: "Albert King has a way with the blues, a realistic, soulful style which hits the mark as all 11 cuts in his latest Stax album demonstrate."

Born Under a Bad Sign was reissued in 2013 by Stax and Concord Records. The reissue features remastered versions of every song from the original release, as well as four alternative versions, one untitled instrumental piece, and additional liner notes. Neil Kelly of PopMatters felt the additional song was enough to warrant a repurchase, and highlighted the instrumental piece. Kelly said: "Booker T and the MG's never sounded better, even on a one-off jam that was never supposed to be issued."

The album was reissued on April 21, 2023 by Stax Records on vinyl and SACD, mastered in hi-res from the original stereo tapes.