Showtime or Show Time may refer to:

• Showtime Networks, a division of CBS which owns the Showtime brand
  • Showtime (TV network), a cable and satellite TV network headquartered in the U.S., part of the CBS division called "Showtime Networks"
• Showtime Arabia, former dominant TV service in the Middle East and North Africa, has since been merged into a pay-TV network called "OSN"
• Showtime movie channels, a suite of Australian premium networks owned under a studio consortium which licenses the Showtime name
• Showtime Scandinavia, a television channel broadcasting action movies to the Nordic countries
• Showtime (film), a 2002 American action/comedy film
• Showtime (Philippine TV series), now known as It's Showtime (variety show), a Philippine noontime variety show
• Showtime (Croatian TV series), a Croatian talent show similar to Pop Idol
• Showtime (South Korean TV series), a South Korean TV series
• Showtime at the Apollo, a syndicated music program
• "Showtime" (Buffy the Vampire Slayer), an episode of Buffy the Vampire Slayer
• "Showtime" (M*A*S*H), an episode of M*A*S*H
• "Showtime", an episode of Law and Order

Showtime! is the thirteenth album (and third live album) by American rock band The J. Geils Band, released in 1982. It was recorded at the Pine Knob Music Theater in Clarkston, Michigan, and proved commercially successfully but most critics consider it to be weaker than the group's two earlier live albums "Live" Full House (1972) and Blow Your Face Out (1976). This was the last release by the band before frontman Peter Wolf left the band.