"Rock with U" is a song by American recording artist Janet Jackson, from her tenth studio album, Discipline (2008). It was written by Ne-Yo, Jermaine Dupri, and Eric Stamile, and produced by the last two. The song was released as the album's second single on February 5, 2008, by Island Records. "Rock with U" is a pop song that was created for the gay community, as Jackson felt the necessity to do something for its members.

"Rock with U" received positive reviews from music critics, with the majority lauding its retro, but futuristic sound, and commending the song's elements of house music. The song had minimal success, only being able to reach the Bubbling Under Hot 100 Singles and the top-twenty of the Hot Dance Club Songs, although it did manage to make the Top 5 of the UK R&B Chart. Saam Farahmand directed the long take music video, which features Jackson having a party inside a club, with red and white rays of light entering the room. "Rock with U" served as the title for Jackson's Rock Witchu Tour the same year, where the song was also performed.

In July 2007, it was announced that Jackson had signed a recording contract with Island Records, after her five-album deal with Virgin Records was fulfilled with the release of her album 20 Y.O. (2006). Jackson's tenth studio album, Discipline, which was an acknowledgment of Jackson's commitment, focus and dedication to her career, was released on February 26, 2008 under the supervision of label head L. A. Reid. She did not write or co-write any songs on the album, a departure from her usual practice of co-writing and producing all of the songs on her albums. "Rock With U" was written by Shaffer Smith, Jermaine Dupri and Eric Stamile, with Dupri producing it, while Stamile co-produced it. In an interview for NewNowNext, Jackson explained that the song was created for the gay community, saying,

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