WJSN (Korean: 우주소녀) is an all-female South Korean K-pop group formed jointly by Starship Entertainment and Yuehua Entertainment. The group made their debut in February of 2016 with 12 members but added a 13th that July: Seola, Bona, Exy, Soobin, Luda, Dawon, Eunseo, Yeoreum, Dayoung, Yeonjung, Xuanyi, Cheng Xiao, and Meiqi. Xuanyi, Cheng Xiao, and Meiqi (each from Yuehua Entertainment) left in 2023.
The group is also known as Cosmic Girls.