Poison ivy is a poisonous plant, though the term is also used for the rash urushiol-induced contact dermatitis, caused by contact with it. It is not a true ivy, which are species of the genus Hedera. Poison ivy may also refer to:
- Poison Ivy (comics), a villain and enemy of Batman in the DC Comics universe.
- Kristy Wallace, a musician whose stage name is "Poison Ivy" and co-founder of the band The Cramps.
- Ivy Lee, a pioneer in public relations and an employee of John D. Rockefeller's (nickname from the United Mine Workers)
- Poison Ivy (film), a 1992 US film.
- Poison Ivy II: Lily, a 1996 US film
- Poison Ivy: The New Seduction, a 1997 US film (aka Poison Ivy 3: Violet )
- "Poison Ivy" (Law & Order episode)
- "Poison Ivy" (song), a 1959 Leiber/Stoller song.
- Poison Ivy (1985 film), a 1985 NBC made-for-television movie.
