45 may refer to:
- 45 (number)
- one of the years 45 BC, AD 45, 1945, 2045
Film
- 45 (2009 film), directed by Peter Coster
- 45 (upcoming film), an upcoming Kannada-language drama film
- .45 (film), directed by Gary Lennon (2006)
Music
- 45 (Jaguares album), 2008
- 45 (Kino album), 1982
- "45" (Bon Iver song), 2016
- "45" (The Gaslight Anthem song), 2012
- "45" (Shinedown song), 2003
- "45" (Elvis Costello song), 2002
- "Forty Five", a song by Karma to Burn from the album Appalachian Incantation, 2010
- 45 rpm record or 45, a common form of vinyl single
Other uses
- Donald Trump, the 45th President of the United States, with the nickname "45"
- 45 (book), written by Bill Drummond
- .45 caliber, a family of firearm cartridges
- A nickname for a handgun chambered in .45 caliber, such as the M1911 pistol or Colt Single Action Army
- .45 ACP, pistol cartridge
- .45 Colt, revolver cartridge
- Jacobite rising of 1745 or "The '45", in the United Kingdom
- Forty-fives, a card game
- 'The 45%', collective term used by Scottish independence campaigners (after ratio of support in 2014 referendum)
- Fortyfive, a software development company
- 45 Eugenia, a main-belt asteroid
- Rover 45, a small family car
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