In music:

• "Summertime" (song), a popular song by George Gershwin from the opera Porgy and Bess
• "Summertime" (Beyoncé song)
• "Summertime" (Bon Jovi song)
• "Summertime" (Kenny Chesney song)
• "Summertime" (DJ Jazzy Jeff and the Fresh Prince song)
• "Summertime" (New Kids on the Block song)
• "Summertime" (Shannon Noll song)
• "Doin' Time" (Sublime song), frequently tagged as "Summertime" on file-sharing sites.
• "Summertime", a song by Cem Adrian from Ben Bu Sarkiyi Sana Yazdim
• "Summer Time", a song by The Pretty Things from the reissue of Parachute
• "Summertime", a song by Diana Ross from Red Hot Rhythm & Blues
• "Summertime", a song by The Sundays from Static and Silence
• "Summertime", a song by Wiley
• Summertime EP, an EP by The Subways
• Summertime (Joe Locke & Geoffrey Keezer Quartet album)
• Summertime (Herb Alpert & the Tijuana Brass album), an album by Herb Alpert & the Tijuana Brass
• "Summertime, Summertime", a song by The Jamies
• "Summertime Summertime", a song by Corina
• 'Summertime', a song by Janis Joplin

In film, television, and theatre:

• Summertime (film), a film starring Katharine Hepburn
• L'Heure D'été (film) (English: Summertime), a French film starring Juliette Binoche
• Summertime (TV), an Irish television film short
• Summertime (2001 film), a South Korean film starring Choi Cheol-ho
• Summertime (cartoon), a 1934 cartoon by Ub Iwerks, featured on an episode of Pee-wee's Playhouse
• Summertime (play), a play by Ugo Betti

In timekeeping:

• Summer Time, advancing the clock one hour during summer, in American English known as daylight saving time