OH MY GIRL (Hangul: 오마이걸) is a seven-member South Korean girl group under WM Entertainment. The group consists of Seunghee (승희), Hyojung (효정), Mimi (미미), YooA (유아), Binnie (비니), Arin (아린) and Jiho (지호). On October 30, 2017, WM Entertainment announced that member JinE would be leaving the group in order to treat her anorexia.

Prior to their debut, they were promoted as B1A4's sister group. OH MY GIRL released their first mini-album OH MY GIRL on April 20, 2015. The title song for the album was "CUPID". They concluded their promotions for the album on June 21 with a performance of b-side "궁금한걸요" on Inkigayo..

Later in the summer of that year, WM Entertainment announced a fall comeback. Member Mimi wrote lyrics for three of the songs on the album. On October 7, OH MY GIRL released their second mini-album CLOSER. The music video for "CLOSER" featured a fairy-tale theme, with constellation-inspired dance steps. The song was met with much critical enthusiasm; it ranked at number 14 on Billboard's "20 Best K-Pop Songs of 2015". Many critics praised the whimsical feel of the song, and described the choreography as being "different" and "innovative".

On March 28, 2016, they released their third mini-album Pink Ocean. Prior to the album release, the single "한 발짝 두 발짝 (STEP BY STEP)" was promoted as an individual release. The song was written by B1A4's leader Jinyoung. The official lead track for the mini was "LIAR LIAR". They performed the song on March 31 at M! Countdown. A month later, on May 26, 2016, Pink Ocean was reissued as Windy Day. The repackaging included two new songs: "Windy Day" and "Stupid In Love".

On August 1, OH MY GIRL released a special summer album featuring modern covers of famous songs. The title track for the album was "Listen to my word(A-ing) (feat.SKULL&HAHA)", a cover of Papaya's LISTEN TO MY WORD featuring Skull & Haha. The album debuted at the top of the Gaon Album Chart for July 31 – August 6, 2016, the first of any OH MY GIRL album to do so.

On August 25, member JinE was revealed to be taking a temporary break from OH MY GIRL-related activities due to symptoms of anorexia. OH MY GIRL continued their contest preparations and upcoming comeback promotions in her absence. On March 13, 2017, WM Entertainment announced that OH MY GIRL's next album was set to be released in April, with the absence of JinE. On April 3, they released their fourth extended play COLORING BOOK. The music video for the album's title track "컬러링북 (Coloring Book)" included a pink whale in JinE's honor.

WM Entertainment announced JinE's departure from the group on October 30, after prolonged discussion with her parents and medical staff, who all agreed that it was best to nullify her contract so she could focus on her health. OH MY GIRL would now reform as an eight-member group.

On January 9, 2018, OH MY GIRL released their fifth extended play Secret Garden. The title track for the album is "비밀정원 (Secret Garden)". The song earned OH MY GIRL their first music show win on The Show on January 23 and their second music show win on Show Champion on January 24.
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