Wonder World is the second Korean-language studio album by South Korean girl group Wonder Girls, released on November 7, 2011, through JYP Entertainment. The track "Be My Baby" served as the lead single from album. Both the album and the single were a commercial success, both having topped the Gaon Album and Digital charts respectively. To promote Wonder World, the group appeared on several South Korean music programs; additionally, Wonder Girls embarked on their Wonder World Tour in July 2012.

Wonder Girls (Korean: 원더걸스) was a South Korean girl group formed by JYP Entertainment. The group debuted in February 2007 with the single "Irony" and 5 members: Yeeun, Sunye, Sunmi, Hyuna and Sohee. After Hyuna's departure in July, Yubin was added into the group prior to the release of their debut studio album, The Wonder Years (2007). The album spawned the hit single "Tell Me", which topped various South Korean music charts.