Look up 420, 4-2-0, or 4/20 in Wiktionary, the free dictionary.

420 may refer to:

Science and technology

• 420 (number), in mathematics
• 420 Bertholda, a main-belt asteroid
• 4:2:0, a chroma subsampling layout

Cannabis culture

• 420 (cannabis culture), informal reference to cannabis use and celebrations on April 20
  • California Senate Bill 420 or the Medical Marijuana Program Act
  • "420" (Family Guy), an episode of Family Guy
  • "4-2-0" (song), a song by Kottonmouth Kings from Rollin' Stoned

Dates

• AD 420, a year in the 5th century of the Julian calendar
• 420 BC, a year
• April 20

Other uses

• 4-2-0, a classification of steam locomotives
• 420 (dinghy), a class of double-handed racing sailboats
• "4:20", a song by Six Feet Under on the 1997 album Warpath
• Section 420 of the Indian Penal Code, a law against cheating and dishonesty
• +420, calling code of Czech Republic