420 (number), is the number between 419 and 421. For the year, see 420 or 420 BC.

420 can also refer to:

• April 20
• 4-2-0, a classification of steam locomotives
• 420 (cannabis culture), a term used as a discreet way to refer to cannabis
  • California Senate Bill 420, colloquially known as the Medical Marijuana Program Act
• 420 (dinghy), in sailing, a class of double-handed racing sailboats
• "420" (Family Guy), an episode of the television series Family Guy
• 420 Bertholda, a large main-belt asteroid
• 4 & 20 meat pies, a popular brand of pies in Australia
• The code for international direct-dialed phone calls to the Czech Republic

See also

• List of highways numbered 420
• Section 420, of the Indian Penal Code, a slang reference for a confidence trickster (now used in India, Pakistan, Bangladesh and Myanmar)

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