40

40 or forty commonly refers to:

• 40 (number), the natural number following 39 and preceding 41
• one of the years 40 BC, AD 40, 1940, 2040

40 or forty may also refer to:

• 40 (record producer) (born 1983), Canadian hip hop producer (born Noah Shebib)
• Forty (album), a 2001 live album by Thomas Dolby
• 40 (Foreigner album), 2017
• 40 (Stray Cats album), 2019
• 40 (Sunnyboys album), 2019
• 40 (Grupo Niche album), 2020
• 40, an album by Peter Morén
• 40 (concert video), by the Allman Brothers Band
• "40" (song), by U2
• "40'", a song by Franz Ferdinand from Franz Ferdinand, 2004
• "Forty", a song by Karma to Burn from Almost Heathen, 2001
• 40Earthshaker album

• 40 ounce or forty, a bottle of malt liquor
• Forty winks or forty, sleep or nap
• .40 S&W, pistol cartridge
• .40 Super, wildcat pistol cartridge
• (, the ASCII character with code 40
• The international telephone code for Romania
• 40 Harmonia, a main-belt asteroid

• 40th (disambiguation)
• Tessarakonteres (English: Forty), a very large ancient Egyptian galley
• Top 40: a radio format; the current, 40 most-popular songs in the music industry
• This Is 40, a 2012 American film