"Lost" is a song by American singer Frank Ocean. It was released as the fourth single from his debut studio album Channel Orange (2012). The song was written by Ocean, Micah Otano and Malay; production was handled by the latter. The single has also been covered by American record production trio Major Lazer, featuring vocals from Danish singer MØ, along with English electro band Swiss Lips.

"Lost" is an R&B and pop song set in common time at a straight-up pop tempo of 123 beats per minute. The song is in a G minor, with a chord progression of Gm−B♭maj7−E♭−B♭maj7 followed throughout, and Ocean's vocal spans from C₄ to G₅. According to The Quietus, "A bouncy indie-rock rhythm and chicken-scratch guitar propels a buoyant Frank, as he takes to the road in the hope of getting well and truly lost in sunny California. Flowing atop a narcotic bass melody and a trio of harmonising vocalists, the choruses eventually pan back for a coda of whistling synths and ELO-esque keys." The lyrical content of "Lost" describes the protagonist's relationship with a cocaine-cooking girlfriend. The song contains samples of the film Fear and Loathing in Las Vegas (1998). The song also may be another Coldplay reference, since Ocean has covered Coldplay's song Strawberry Swing, and sampled Lovers in Japan and Life in Technicolor, all by Coldplay.

"Lost" has received high praise and acclaim among critics, praising Ocean's idiosyncratic style and pop sensibilities as well as Malay, the album's prominent producer. It is often referred to as a highlight on his debut studio album Channel Orange and is his most straightforward "pop" song.

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