Firewall

Firewall may refer to:
 * Firewall (computing), a technological barrier designed to prevent unauthorized or unwanted communications between computer networks or hosts
 * Firewall (construction), a barrier inside a building, designed to limit the spread of fire, heat and structural collapse
 * Firewall (engine), the part of a vehicle that separates the engine compartment from the rest of the vehicle
 * Firewall (physics), a hypothetical phenomenon where a freely falling observer spontaneously burns up at the horizon of a black hole
 * Firewall (politics), also known as Cordon sanitaire (politics): the refusal of one or more political parties to cooperate with certain other political parties.
 * For example, see Firewall against the far-right in Germany

Music

 * Firewall, an alias of British musician Lange (born 1974)
 * "Firewall", a song by Steve Vai from the 2005 album Real Illusions: Reflections
 * "Firewall", a song by Kompany from the 2019 extended play Metropolis

Literature

 * Firewall (Andy McNab novel), a Nick Stone adventure
 * Firewall (Mankell novel), a 1998 novel by Henning Mankell, featuring Kurt Walland

Film and television

 * Firewall (film), a 2006 thriller film written by Joe Forte, starring Harrison Ford
 * "Firewall" (Person of Interest), an episode of the American television drama series Person of Interest
 * "Firewall", an episode from the Canadian animated series ReBoot

Characters

 * Firewall, a fictional character in the G.I. Joe universe