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

Arts, entertainment, and media
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 computer-animated series ReBoot

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

See also
Alberta Agenda, also known as the Alberta Firewall, a political proposal for the Canadian province
firewalld, a firewall management tool for Linux operating systems
Great Firewall, China's internet censorship firewall
Chinese wall, a zone of non-communication between distinct sections of a business, in order to prevent conflicts of interest
Personal firewall, a very popular form of firewall designed to protect personal computers
Reredos, a short wall behind a fire in a traditional hearth
Wall of Fire (disambiguation)