The Avanti (including the Avanti II) is an American performance sports coupe based on the Studebaker Avanti and marketed through a succession of five different ownership arrangements between 1965 and 2006.

After Studebaker's December 20, 1963, closure of its South Bend factory and effective discontinuation of the auto with the 1964 model year, cars carrying the Avanti nameplate were initially produced from leftover Studebaker components, and later by the Avanti Motor Company from General Motors and Ford chassis and engines. A small and often interrupted stream of increasingly modified cars was made before all production ceased in 2006.

After Studebaker ended production at South Bend on December 20, 1963, the "Avanti" model name, tooling, Studebaker truck production rights, as well as parts and plant space were bought by local Studebaker dealers, Nate and Arnold Altman and Leo Newman, who incorporated as Avanti Motor Corporation and hand-built a small number of cars. Leo Newman ran the Studebaker truck parts division, which enabled the company to be profitable at its outset. According to Stu Chapman, Studebaker Director of Advertising & Public Relations 1964–1966, in his book "My Father The Car: Memoirs Of My Life With Studebaker", there was talk with Studebaker about reintroducing the Avanti to Studebaker showrooms in 1965/66, along with ambitious plans for rebadging an Isuzu Bellett as an entry-level Studebaker, and combining with Canadian Motor Industries.

The Altman brothers introduced a slightly modified version of the car in 1965 under the brand name "Avanti II". which initially had a 327 cu in (5.4 L) Chevrolet Corvette engine. This evolved to the 400, then the small-block 350, and then the 305 for 1981. The 305 cu in (5.0 L) V8 had electronic engine controls, 155 hp (116 kW), and GM's Turbo 350 automatic transmission with lock-up. Building one of the 1980s Avanti IIs required 10 to 12 weeks, depending on special color or upholstery orders. The last Avanti II made was a one-off with a Roush V6 engine. After Nate Altman's death, Arnold Altman ran the company until it was sold in 1982. From 1963 through 1985, Avanti IIs were built on the Studebaker-designed chassis, then the Chevrolet Monte Carlo chassis was used; Chevy discontinued the Monte Carlo in 1987, and Avanti switched to the Chevrolet Caprice chassis.

On October 1, 1982, real-estate developer Stephen H. Blake bought the rights to the Avanti II. The state of Indiana guaranteed $1.9 million in loans to Avanti as part of the financial package offered Blake when he bought the company.

Modifications were introduced to the car, which had remained unchanged since the production of the Avanti II model began in the mid-1960s. A new convertible body style along with an all-new and lighter backbone chassis that was designed by Herb Adams, a former Pontiac engineer, using a torque tube with a 1985 Chevrolet Corvette aluminum rear end and independent suspension. These plans were shelved in favor of the G-body Monte Carlo chassis as it could accept Chevrolet V8s. The newly approved rectangular headlights with matching openings were introduced along with plastic body-colored bumpers. Each car took eight to ten weeks to hand-build.

Shortly after introducing the Mark II Avanti, the company declared bankruptcy, and Blake resigned in February 1986.

The Avanti Motor Company was purchased by Michael Eugene Kelly, whose ownership was very brief because the company's ownership changed in 1987.