"Smile" is a song by Canadian recording artist Avril Lavigne from her fourth studio album, Goodbye Lullaby (2011). It was co-written by Lavigne, Max Martin and Shellback and produced by Martin and Shellback. "Smile" was released on April 11, 2011 by RCA Records as the second single from the album to Australian radio stations and then on May 17 in the United States contemporary hit radio. Upon its release, the song received critical acclaim from music critics, who described the track as a "sassy and catchy pop song". It has charted inside the top-thirty on the Australian, Japanese and New Zealand charts, in addition to being certified by the recording industry associations of Australia and the United States. A music video directed by Shane Drake was filmed in April 2011 and released on May 20. By November 2014, the music video had reached 100 million views on Vevo.

"Smile" was written by Lavigne along with its producers, Max Martin and Shellback. It was recorded at Maratone Studios in , Sweden. "Smile" pays tribute to the special someone who was able to win her heart and put a grin on her face. Backed up by a punchy drum rhythm and electric guitars, Lavigne offers even more reasons why most normal guys would run in the other direction, then praises her guy for sticking around. Lavigne asked her fans via Twitter what the next single from Goodbye Lullaby should be, giving the choices between "Push" and "Smile". Lavigne confirmed that "Smile" was to be the second single from the album though reports suggest Lavigne was fighting for a "Push" release. The singer's record label, RCA Records, announced that "Smile" will be sent out to Polish radio in April, with the same expected to happen in other territories such as Canada, New Zealand, Asia, and the UK. She posted photos to her Twitter of the set of the music video, filmed on April 21, 2011.

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