"Mister (Hangul: 미스터, Japanese: ミスター)" is a song performed by South Korean girl group Kara from their second Korean album, Revolution. It was released as their Japanese debut single on August 11, 2010. It was released in four editions, one includes a DVD, another one is CD with a 28-page photobook, and two CD only editions, first press and regular.

The song was originally from the group's second Korean album Revolution. The group performed this song as a part of their comeback stage special alongside Revolution's lead single, "Wanna", starting on July 31, 2009, beginning with KBS's Music Bank then onto MBC'sShow! Music Core and finally on SBS's Inkigayo. After wrapping up their comeback stages to begin promotions for their second full-length Korean album, the song proved to be popular with the viewers due to its addicting "butt dance" that is featured prominently in the choreography; helping the group's Revolution album to perform well on various music charts prompting the group to promote the song more on music programs rather than the actual lead single, "Wanna". Due to the overwhelming response that "Mister" received, the group's overall popularity in South Korea increased, with numerous advertisement requests coming in for the group as they had more advertisements in October 2009 than the previous two years.

On May 8, 2010, it was announced at a press conference in Akasaka that the group would be making their long-awaited Japanese debut with a Japanese version of the song during summer. On July 15, 2010, Universal Music Japan released the promotional video teaser of "Mister" stating that their single will be released on August 11, 2010. Upon release, their Japanese debut single ranked #5 in the Oricon daily chart. The group held a surprise performance at Shibuya109 in Tokyo on the same day. Although the event was not officially announced, 3,000 fans who heard the news immediately gathered to watch the group perform. As there was a greater number of people who arrived than expected, their Japanese label, Universal Sigma, had to suspend the concert in 3 minutes when it was supposed to last 30, because the location of the concert was a famous traffic area in Tokyo, and the massive gathering of the crowd could be dangerous for the people's safety. Multiple Japanese news media, including Sankei Sports, has reported this unbelievable event, and confirmed the group's successful debut in Japan.

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