Paranoia is a thought process that typically includes persecutory delusions.

Paranoia may also refer to:

• Paranoia (Hermans book), a 1953 short story collection by the Dutch writer Willem Frederik Hermans
• Paranoia (novel), a novel by Joseph Finder

• Paranoia (1967 film), a Dutch drama
• Paranoia (1969 film), originally titled Orgasmo, an Italian drama directed by Umberto Lenzi
• Paranoia (1970 film) (released in the U.S. as A Quiet Place to Kill, to avoid confusion with Orgasmo), an Italian film, also directed by Umberto Lenzi
• Paranoia, a 1998 cable TV American thriller starring Sally Kirkland
• Paranoia (2013 film), a thriller starring Gary Oldman, Liam Hemsworth and Harrison Ford
• Paranoia (2021 film), an Indonesian thriller drama film
• Paranoia (game show), a 2000 live, interactive American game show
• "Paranoia" (Brooklyn Nine-Nine), an episode
• "Paranoia" (Law & Order), an episode of Law & Order
• "Paranoia" (Law & Order: Special Victims Unit), an episode of Law & Order: Special Victims Unit

• Paranoia (role-playing game), a 1984 dystopian science-fiction role-playing game
• Paranoia (video game), a 1995 Czech videogame

• Paranoia (album), 1999 album by Nikolai Noskov
• Paranoia: A True Story, 2017 EP by Dave East
• Paranoia 2, 2018 mixtape by Dave East

• "Paranoia" (A Day to Remember song), 2016
• "Paranoia" (Eiko Shimamiya song), 2009
• "Paranoia", by 180 (Naoki Maeda) from the video game Dance Dance Revolution
• "Paranoia", by Hawkwind from Hawkwind
• "Paranoia", by Lovebites from Glory, Glory, to the World
• "Paranoia", by Royce da 5'9" from Independent's Day
• "Paranoia", by Sam Roberts from We Were Born in a Flame
• "Paranoia", by Soulfly from Conquer
• "Paranoia", by White Ash from Quit or Quiet
• "Paranoia, Paranoia", by Bauhaus, a B-side of the single "Lagartija Nick"

• cdparanoia, a CD-ripping tool
• Paranoia 1.0, a 2004 science-fiction film
• Paranoiac (film), a horror movie
• Paranoid (disambiguation)
• "Paranoimia," a 1986 song by the Art of Noise