Junk (ship), sailing vessel of Chinese origin

Junk mail, unwanted electronic mail, also called spam

Junk mail, unwanted postal mail, typically from direct marketing operations

Junk DNA, DNA without a known function for the organism

Junk bond (finance), a bond rated 'BB' or lower because of its high default risk. Also known as a "high-yield bond", or "speculative bond".

Junk (Transformers), fictional planet in the Transformers universe

Junk (novel), by Melvin Burgess

Junker (disambiguation)

Junk (band), a british pop band

Scrap, metallic waste, or waste in general (American Usage)

Hard drugs, especially heroin

A slang term for the male genitalia

"Junk", a song written by Paul McCartney

Junk, the working title for the Burroughs novel Junkie

A nickname of the character Suigintou of the Japanese manga and anime Rozen Maiden, analogous to Desu for Suiseiseki.