Forbidden
Forbidden may refer to:

Science
Forbidden mechanism is a spectral line associated with absorption or emission of photons by atomic nuclei, atoms, or molecules which undergo a transition that is not allowed by a particular selection rule but is allowed if the approximation associated with that rule is not made.

Films
Forbidden (1919 film), directed by Phillips Smalley and Lois Weber
Forbidden (1932 film), directed by Frank Capra
Forbidden (1949 film), directed by George King
Forbidden (1953 film), directed by Rudolph Maté
Forbidden (Proibito), a 1954 Italian film directed by Mario Monicelli
Forbidden (1984 film), directed by Anthony Page
The Forbidden (2018 film), a Uganda film

Literature
Forbidden (Cooney novel), a 1994 novel by Caroline B. Cooney
Forbidden, a 2010 novel by Tabitha Suzuma
Forbidden (Dekker and Lee novel), a fantasy novel by Ted Dekker and Tosca Lee
"The Forbidden" (short story), by Clive Barker

Music
Forbidden (band), an American thrash metal band
Forbidden (Black Sabbath album) (1995), also the title track
Forbidden (Todrick Hall album) (2018), also the title track
"Forbidden", a 2022 song by Chris Brown from Breezy

Other uses
Forbidden Technologies plc, a UK company
"ForBiddeN", nickname of model-stylist Christine Dolce
Forbidden Peak, in the North Cascades mountains, Washington state, United States