"I Need You" is a song performed, written and produced by MOBO Award-winning English hip hop , N-Dubz. The song was written by all the group members: Dappy, Fazer and Tulisa. Dappy and Fazer have been noted as the track's producers. Released through on 9 November 2009, "I Need You" acted as the group's eighth official single as well as the lead single from their Platinum-certified second album, .

The song was written by all the members of the group, and produced by members Dappy and Fazer. "I Need You" is a hip-house song that uses club synthesisers and that were described by Digital Spy as "Hawkish." Among the influences in the song include: R&B, pop, house and British hip hop. The track is composed in the key of A-minor with a tempo of 130 beats per minute. The track has a vocal structure of intro - verse - chorus - verse - chorus - bridge - chorus - outro. The intro and outro use lines from the chorus where Dappy sings and ad-libs, the outro however combines ad-libs of both Dappy and Tulisa. The first verse and chorus is sung and rapped in call-response by Dappy. The second verse is sung in call-response by Tulisa, who then joins in on call-response with Dappy in the second and final choruses. Fazer raps the song's bridge. Ad-libs are sung throughout the song by Dappy with Tulisa contributing to the ad-libs in the final chorus.

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