"She's Back" is a song released by the South Korean boy band Infinite. The song is the second single from their debut mini album First Invasion and it was released as a digital single on August 4, 2010. The song was later re-recorded in Japanese and will be used as the group's third Japanese single, released in August 29, 2012.

The song was written by Song Soo Yun, Han Jaeho, Kim Seungsoo (also known as Sweetune) and Mithra Jin from Epik High. It was produced by Kim Seungsoo. Sweetune is also known for producing the songs "BTD (Before the Dawn)", "Be Mine" and "Paradise" of the group.

The group started promoting the track in August 5, 2010 on Mnet's M! Countdown, following the promotions of their debut single "Come Back Again". The song was also promoted on the shows Music Bank,Show! Music Core and Inkigayo. The promotions of the song and of the EP First Invasion ended in September 11, on MBC's Music Core.

A teaser of the music video was released in August 1, 2010. The music video was released in August 4, 2010, along with the digital release of the single. The music video feature the group playing on a beach and on a swimming pool. It also features scenes of the group singing the song together.

The song debuted at the number 80 in Gaon's singles chart on the week of August 8 and climbed to the position 66 on the following week, making the peak of the song. On the following week the song dropped to number 95. The song was more successful than the previous single "Come Back Again".

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