A poison pen letter is malicious correspondence.

Poison Pen may also refer to:

• Poison Pen (album), a 2006 album by Chino XL
• "Poison Pen" (song), a 1986 song by Hoodoo Gurus
• Poison Pen (play), a 1937 play by Richard Llewellyn
• Poison Pen, a 1993 English play by Ronald Harwood
• Poison Pen (1939 film), a British film based on the 1937 play
• Poison Pen, a biography of American author and journalist Kitty Kelley by George Carpozi Jr.
• Poison Pen (2014 film), an Irish film with screenplay by Eoin Colfer
• Poison pen (weapon), an improvised North Korean weapon
• Poison Pen Films, a UK film company

See also[edit]

• Poisoned Pen Press, American publisher of mysteries