"You Don't Know What to Do" is a song by American singer and songwriter Mariah Carey included on her fourteenth studio album, Me. I Am Mariah... The Elusive Chanteuse (2014), and features rapper Wale. The track was released on June 30, 2014, as the fourth single from the album. It was written by Wale, Carey, Jermaine Dupri and Bryan-Michael Cox, with production helmed by the latter three. The song contains an interpolation of "I'm Caught Up in a One Night Affair" written by Patrick Adams and Terri Gonzalez, both of whom received songwriting credits as a result. The single's artwork caused controversy when the media criticised Carey for photoshopping and re-using images of herself. Carey herself later expressed her discontent on the matter, stating that she had no knowledge of the single's artwork until it was released.

A disco revival song, the lyrics are about Carey being dissatisfied by her lover's failed attempts at romancing her. Despite being serviced to urban and rhythmic radio in the United States, Belgium and South Korea were the only territories where the song charted, peaking at number 14 on its Ultratip chart, which ranks the top songs that have yet to enter the main Ultratop 50 chart, and number 2 on the South Korea download chart. "You Don't Know What to Do" garnered critical acclaim amongst music critics: many complimented the disco revival and throwback style, calling it the best track on the album, and compared it to the works of Jocelyn Brown, Daft Punk, Chic and post-revivalist songs produced Pharrell Williams. Carey and Wale performed the song for the first and only time on the Today show in the United States.

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