Airfix is a British brand and former manufacturing company which produced injection-moulded plastic scale model kits. In the UK, the name 'Airfix' has become practically synonymous with plastic models of this type, often simply referred to as "an airfix kit" even if made by another manufacturer.

A plastic model kit,, is a consumer-grade plastic scale model manufactured as a kit, primarily assembled by hobbyists, and intended primarily for display. A plastic model kit depicts various subjects, ranging from real life military and civilian vehicles to characters and machinery from original kit lines and pop fiction, especially from eastern pop culture. A kit varies in difficulty, ranging from a "snap-together" model that assembles straight from the box, to a kit that requires special tools, paints, and plastic cements.