Reboot (stylized as REBOOT) is the third and final studio album by South Korean girl group Wonder Girls. It was released on August 3, 2015 through JYP Entertainment. The Wonder Girls were more involved in the composition of this album, with each member having some writing and/or production credits on each song. This is the first album in years to feature member Sunmi and the first since the departure of members Sunye and Sohee.

The album musically conveys a 1980s-inspired style, incorporating genres including synthpop, hip hop, pop rock and dance-pop. It was well received by music critics, who praised its 1980s-inspired theme as unique for a K-pop artist and compared its music to that of Madonna.Reboot charted at number five on South Korea's Gaon Album Chart and number two on the Billboard World Albums.

Its lead single "I Feel You" was released on August 2, 2015. It was mostly inspired by 1980s dance music. It peaked at number one on eight single charts in South Korea.

On June 24, 2015 it was reported that member Sunmi (Mimi) would return to the group after her departure in February 2010. On July 20, it was confirmed that members Sohee and Sunye had officially withdrawn from the group. The same day, JYP Entertainment announced the return of the Wonder Girls with a new band concept. For this concept, Sunmi plays bass guitar, Yubin plays drums, Hyelim plays guitar, and Yeeun plays piano. Individual teasers of the members playing their respective instruments began being released on July 20. Despite the concept, none of the members actually recorded instrumentals for the album, despite learning to play the instruments and performing songs with their instruments live. On July 29, a promotional video for the release of Reboot was released on YouTube. On August 2, lead single "I Feel You" was released. It was promoted with a music video.

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