A poison pen letter is malicious correspondence.
Poison Pen may also refer to:
Poison Pen (album), a 2006 album by Chino XL
Poison Pen (film), a 1939 British film based on the 1938 play
"Poison Pen" (song), a 1986 song by Hoodoo Gurus
Poison pen (weapon), an improvised North Korean weapon
Poison Pen Films, a UK film company
Poison Pen (2014 film), an Irish film with screenplay by Eoin Colfer
Poison Pen (Harwood play), a 1993 English play starring Tom Courtenay
Poison Pen: A Play in Three Acts, a 1938 play by Richard Llewellyn
