OH MY GIRL (Korean: 오마이걸) – also known as OMG for short – is an all-female South Korean musical group that debuted on April 20, 2015 with an EP of the same name. Originally an 8 piece group formed by WM Entertainment, its lineup now consists of Hyojung, Mimi, YooA, Seunghee, Yubin, and Arin. JinE left the group in 2017 due to health issues, and Jiho left in 2022. OMG is the sister group to B1A4.