A fifth column is a group of people who undermine a larger group from within.

Look up fifth column or fifth columnist in Wiktionary, the free dictionary.

Fifth Column may also refer to:

• The Fifth Column, a 1938 play by Ernest Hemingway, published in the volume The Fifth Column and the First Forty-Nine Stories
• Fifth Column, a 1940 book by John Langdon-Davies

• The Fifth Column (film) (also known as Hinkerort zorasune), a 2010 short film set in Beirut
• "The Fifth Column", episode 2.35 of the military science fiction series Exosquad
• Fifth Column (V franchise), a subgroup of aliens in the V science fiction franchise
• Die fünfte Kolonne [de] (The Fifth Column), a German television series

• Fifth Column (band), an all-women post-punk band from Toronto, Canada
• The 5ifth Column, an album by industrial rock band Acumen Nation
• Fifth Column, a 2003 album by British musician U.N.P.O.C.
• The 5th Column, official street team of the rock band AFI
• Fifth Column Records, an industrial record label active in the 1990s

• Fifth Column (intelligence operation), a Second World War deception operation by MI5
• The Fifth Column, a political and media gossip page in Ireland's Sunday Independent
• Fifth Column (sotūn-e panjom), an editorial in the Iranian newspaper Jame'e written by Ebrahim Nabavi
• The 5th Column, a fictional Nazi group in the City of Heroes MMORPG computer game
• The Fifth Column Podcast, a libertarian-leaning podcast hosted by Kmele Foster, Michael C. Moynihan, Matt Welch.

• Sixth Column, a 1941 science fiction novel by Robert A. Heinlein

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