A junkie (or junky) is a heroin addict. The word has also come to be used to describe addicts in general, and even more loosely, enthusiasts and obsessives (as in the term "science fiction junkie").

• Junky is also the title of a book by William S. Burroughs which has also been published under the alternate spelling, Junkie.
• Junk is a book by Melvin Burgess