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
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 IPC (film), a 2021 Indian Hindi-language crime thriller film
- Chachi 420, a 1997 Indian Hindi-language comedy-drama film, starring Kamal Haasan
- Mr. 420 (2012 film), an Indian Kannada-language romantic comedy film
- Shree 420, a 1955 Indian Hindi-language comedy-drama film, starring Raj Kapoor
- Uyarthiru 420, a 2011 Indian Tamil-language film
- +420, calling code of the Czech Republic
- Maserati 420, a saloon