"Work It" is a hip hop song written by American rapper Missy Elliott and her producer Tim "Timbaland" Mosley for Elliott's fourth studio album Under Construction (2002). The song's musical style, and production by Timbaland, were heavily inspired by old school hip hop from the 1980s, and includes a portion which samples Run-D.M.C.'s "Peter Piper". The beginning of the song samples Rock Master Scott & the Dynamic Three's "Request Line".

Released as the album's first single in September 2002, the track reached the number two position on the US Billboard Hot 100, becoming Missy Elliott's most successful single to date. A remix of this song features 50 Cent. The end of the song samples "Take Me to the Mardi Gras" by Bob James, and the synth pattern in the rhythm track samples the intro of "Heart of Glass" by Blondie.

The music video to "Work It" was directed by Dave Meyers. Timbaland, Eve and Tweet make cameos in the video, as well as a brief appearance by actress/dancer Alyson Stoner. Aaliyah (1979–2001) and Lisa "Left Eye" Lopes (1971–2002), who at the time had both recently died, are commemorated in the music video with their images airbrushed on a car's hood. It also features an appearance by dancer and graffiti writer Mr. Wiggles from Rock Steady Crew. There is another music video that features 50 Cent rapping the first verse on the remix.

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