Summer time or summertime may refer to:

• Summer (the season of the year)
• Summertime (song), a song composed by George Gershwin for the opera Porgy and Bess
• Summertime (1937 film), a 1937 comedy by Ugo Betti.
• Summertime, a rap song by DJ Jazzy Jeff & the Fresh Prince (aka Will Smith) released in 1991
• Summertime (film), a 1955 film starring Katharine Hepburn
• Summertime (album), an album by Herb Alpert & the Tijuana Brass.
• As two words, summer time is an alternative term for daylight saving time. More specifically, see British Summer Time or European Summer Time.