"Summertime" is a song by American singer Beyoncé Knowles featuring American rapper P. Diddy. "Summertime" was written by Knowles, Angela Beyincé, P. Diddy, Steven "Steven J." Jordan, Adonis Shropshire, Varick "Smitty" Smith and Mario Winans, while production was handled by Winans and P. Diddy. The song was later remixed to feature vocals from American rapper Ghostface Killah. "Summertime" was included on the soundtrack album for the film The Fighting Temptations (2003), in which Knowles played the lead female role. The original version of the song was released as a B-side to "Crazy in Love" in the UK and Australia, while it was issued as a 12-inch vinyl single in the United States through Columbia Records.

"Summertime" is an R&B song which lyrically refers to falling in love. Music critics generally complimented Knowles' vocals in the song and noted that it could have been included on her debut studio album, Dangerously in Love (2003). The song also charted on the US Billboard Hot R&B/Hip-Hop Songs chart in late 2003. The original version featuring P. Diddy and the remix version featuring Ghostface Killah peaked at number thirty-five and at number fifty-one respectively on the chart. Both versions charted for forty consecutive weeks. "Summertime" was part of Knowles' set list during the Dangerously in Love Tour (2003), and the Verizon Ladies First Tour (2004).

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