"Tilt Ya Head Back" is a song by American recording artists Nelly and Christina Aguilera, taken from Nelly's album Sweat (2004). The song was released to radio stations in the US in September 2004 as the second single from the album. Written by Nelly, Dorian Moore and Tegemold Newton and produced by Doe Mo' Beats, "Tilt Ya Head Back" is a hip hop and funk number and features a sample of Curtis Mayfield's "Superfly".

Most contemporary critics were positive toward the song, who praised the duo's vocal and deemed it as one of the album's highlights. Commercially, "Tilt Ya Head Back" garnered moderate success, peaking at number 58 on the US Billboard Hot 100 and charting within the top ten charts of Australia, Denmark, New Zealand, and the United Kingdom. An accompanying music video for "Tilt Ya Head Back" was directed by Little X. The duo performed the song at the 2004 MTV Video Music Awards, which gained positive feedback from media outlets.

"Tilt Ya Head Back" was written by Nelly, Dorian Moore, Tegemold Newton, Curtis Mayfield and produced by Doe Mo' Beats. The producer of the song confirmed that it was originally meant for Nelly and Britney Spears, however Spears' record label Jive Records rejected the idea because they thought the song was "too urban", even though Spears wanted to do it. A snippet of Britney's version was premiered at Singaporean radio Gold 90.5 the 22nd March 2016. Following Spears, Janet Jackson and Christina Aguilera were approached to appear on "Tilt Ya Head Back", and the final choice was Aguilera.

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