"Smile" is a song by American hip hop group G-Unit, released in April 2004, as the fifth and final single from their debut album, Beg for Mercy (2003). The song was produced by No I.D. and contains a sample "I Too Am Wanting", as performed by Syreeta.

Lloyd Banks is the main artist on the song, with his G-Unit cohort 50 Cent, only singing "be the reason you smile" as a background vocal on the refrain. The song was released to promote Lloyd Banks' debut solo album, The Hunger for More, two months before the album was released in June 2004. It is similar in scope to 50 Cent's solo single, "21 Questions", being a soft love song augmenting many hardcore rap tracks.

The video goes through Lloyd Banks' life from a child to an adult. It features Banks' two brothers, who play him at different points in his life. Former G-Unit Records artist, Olivia, is the adult girl featured in the video. The video was directed by Jessy Terrero.

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