Fiber cement siding ("fibre cement cladding" in the UK and "fibro" in Australia) is a building material used to cover the exterior of a building in both commercial and domestic applications. Fiber cement is a composite material made of cement reinforced with cellulose fibers. Originally, asbestos was used as the reinforcing material but, due to safety concerns, that was replaced by cellulose in the 1980s. Fiber cement board may come pre-painted or pre-stained or can be done so after its installation.

Fiber cement siding has several benefits since it is resistant to termites, does not rot, is impact resistant, and has fireproof properties.