The Enemy Within

• The Enemy Within (Kennedy book), by Robert F. Kennedy, 1960
• The Enemy Within (play), by Brian Friel, 1962
• The Enemy Within, 1986 Volume 3 of L. Ron Hubbard's Mission Earth series
• The Enemy Within (Milne book), by Seumas Milne, 1994
• The Enemy Within (novel), by Christie Golden, 1994
• The Enemy Within (Savage book), by Michael Savage, 2003
• Hitman: Enemy Within, a 2007 novelization of the video game Hitman
• The Enemy Within: Terror, Lies, and the Whitewashing of Omar Khadr by Ezra Levant, 2011
• The Enemy Within (Rusch novel), by Kristine Kathryn Rusch, 2014
• Enemies Within: Communists, the Cambridge Spies and the Making of Modern Britain by Richard Davenport-Hines, 2018
• The Enemy Within: How the ANC Lost the Battle Against Corruption by Mpumelelo Mkhabela, 2022.

• The Enemy Within (1918 film), a 1918 Australian silent film
• The Enemy Within (1994 film), an HBO thriller starring Forest Whitaker
• Doctor Who: The Enemy Within (1996 film), FOX TV network telefilm
• The Enemy Within (2013 film), a 2013 Greek film

• "The Enemy Within", a song by Rush from the album Grace Under Pressure
• Enemy Within (album), a 1986 album by Chris Spedding
• "Enemy Within", a 1989 song by D.R.I. from Thrash Zone
• "The Enemy Within", a 1996 song by Cherry Poppin' Daddies from Kids on the Street
• The Enemy Within, a 1998 album by Concord Dawn
• "Enemy Within", a 2001 song by Arch Enemy from Wages of Sin

• Doctor Who (film), a 1996 television movie based on the British science fiction series Doctor Who, alternatively titled Enemy Within
• The Enemy Within (TV series), a 2019 American television series

Episodes

• "The Enemy Within" (Star Trek: The Original Series), 1966
• "The Enemy Within" (MacGyver), 1986
• "The Enemy Within" (Stargate SG-1), 1997
• "Enemy Within" (Law & Order: Criminal Intent), 2001
• "The Enemy Within" (NCIS), 2015
• "The Enemy Within" (Under the Dome), 2015

• The Enemy Within Campaign, a 1986 series of adventures for Warhammer Fantasy Roleplay
• "The Enemy Within", a 2002 article by Gore Vidal about the 9/11 attacks
• "The Enemy Within", a 2010 article by Mark Bowden about the Conficker Worm
• "XCOM: Enemy Within", a 2013 expansion pack to the 2012 video game XCOM: Enemy Unknown
• "Batman: The Enemy Within", a 2017 point and click adventure video game developed by Telltale games

• "The Enemy Within the Gates", a 1968 radio and television episode of Dad's Army
• The Enemy Inside (disambiguation)
• Fifth column
• Internal enemy

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