Lifetime may refer to:

• The period between one's birth and death
• Life expectancy, the length of time a person is expected to remain alive
• lifetime to be essence in biology living is the reference of gains with studys on time to be obtained the time of life.

• Lifetime (band), a melodic hardcore band from New Jersey
• Life Time (Rollins Band album), by Rollins Band
• Life Time (Tony Williams album), by American jazz drummer Tony Williams
• Lifetime (Lifetime album), a 2007 album by the band Lifetime
• Lifetime (Real Life album), 1990
• Lifetime (Klein album), 2019
• LifeTimes, a 1979 album by Diana Hubbard
• "Lifetime" (Katharine McPhee song), a 2010 song from Unbroken
• "Lifetime" (Noah and the Whale song)
• "Lifetime" (Maxwell song), a 2002 song by American R&B singer Maxwell
• "Lifetime" (Swedish House Mafia song)
• "Lifetime" (Three Days Grace song)
• "Lifetime" (Usher song)
• "Lifetimes" (song), a 2024 song by Katy Perry from 143
• "Lifetime", a 2009 song by Kris Allen from Kris Allen
• "Lifetime", a 2021 song by Justin Bieber from Justice
• "Lifetimes", a 2001 track by Slam
• "Lifetimes", a 2005 song by Sheryl Crow from Wildflower

• "Life Time" (M*A*S*H), a 1979 episode of the TV series M*A*S*H
• Lifetime (Southeast Asian TV channel), an Asian television channel owned by A+E Networks Asia
• Lifetime (TV network), a cable television programming network geared towards women
  • Lifetime (Canadian TV channel), the Canadian version of the TV channel of the same name
• Lifetime (British and Irish TV channel), a defunct British entertainment television channel
• Lifetime Entertainment Services (LES), an American entertainment industry company
• LMN, formerly Lifetime Movie Network and Lifetime Movies, an American digital cable and satellite television network

• Lifetimes, an alternative English-language title for a 1994 Chinese film, also known as To Live
• Lifetimes: True Accounts of Reincarnation (1979), a book by Frederick Lenz
• Lifetimes, alternate English title for the 1994 Chinese film To Live

• Mean lifetime, a certain number that characterizes the rate of reduction ("decay") of an assembly of unstable particles
• Object lifetime, in object-oriented programming, the time between an object's creation until the object is no longer used
• Product lifetime, a product's expected lifetime
• Service life, a product's expected time in use between point of sale and point of discard

• Lifetimes, a museum in Croydon, England (1995–2004), now known as the Museum of Croydon
• Lifetime Products, a manufacturer of tables, chairs, outdoor sheds, utility trailers, and residential basketball equipment

• "A Lifetime", a 2001 song by Better Than Ezra
• Life span (disambiguation)