Any wall built for the purpose of restricting or preventing the spread of fire in a building. Such walls of solid masonry or concrete generally subdivide a building from the foundations to 2 feet or more above the plane of the roof.
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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