The Avenger GT was a car designed and manufactured, in the United States of America, primarily in the 1960s and early 1970s. The car was manufactured by Fiberfab, a company founded by Warren "Bud" Goodwin and was the successor to the Fiberfab Aztec. The car was styled to resemble the Ford GT, of racing fame in the 1960s, often referred to as the GT40.

The Avenger GT came in two models, the Avenger GT-12, and the Avenger GT-15.

The GT-12, was designed to be assembled by the owner, using parts salvaged from other cars, most often, a Volkswagen Beetle.

The GT-15, was similar, but utilized a tube frame chassis, designed to accept suspension and drivetrain components for a Chevrolet Corvair.

These cars had a big sister, known as the Fiberfab Valkyrie. The Valkyrie was styled similarly, with the most obvious difference being a somewhat shortened rear end on the body. Since the Corvair and the Beetle, were rear engined, the body needed to be a bit longer. The Valkryie, however, was designed to be powered by a mid-engined V8 engine.