A fiber composite plastic (FRP; also fiber-reinforced plastic or fiber-plastic composite; FKV, English fiber-reinforced plastic) is a material consisting of reinforcing fibers and a plastic matrix. The matrix surrounds the fibers, which are bound to the matrix by adhesive interactions. The way in which the fibers are introduced can create a direction-dependent elasticity behavior (parallel or cross-white introduction).

Without matrix material (adhesive), the high specific strengths and stiffness of the reinforcing fiber cannot be used. A new construction material is only created through the appropriate combination of fiber and matrix materials.

Early attempts to develop resin-bonded fiber composites led to the development of linoleum in the mid-19th century. The best-known fiber composite plastic today is glass fiber reinforced plastic (GRP).

Fiber composite plastics have several advantages over traditional materials. They are light, robust and resistant to moisture, corrosion and chemical influences. This makes them ideal for applications where low weight, high strength and durability are required, such as automotive, aerospace or construction.

There are different types of fiber composite plastics that can be selected depending on the application needs and the desired properties.

Some of the most well-known types are carbon fiber composites and fiberglass composites.