The Pontiac Bonneville was an automobile

Automobile

An automobile, autocar, motor car or car is a wheeled motor vehicle used for transporting passengers, which also carries its own engine or motor...

 built by the Pontiac

Pontiac

Pontiac was an automobile brand that was established in 1926 as a companion make for General Motors' Oakland. Quickly overtaking its parent in popularity, it supplanted the Oakland brand entirely by 1933 and, for most of its life, became a companion make for Chevrolet. Pontiac was sold in the...

 division of General Motors

General Motors

General Motors Company , commonly known as GM, formerly incorporated as General Motors Corporation, is an American multinational automotive corporation headquartered in Detroit, Michigan and the world's second-largest automaker in 2010...

 from 1957 to 2005. It was introduced as a limited production performance convertible during the 1957 model year. The Bonneville (known as the Parisienne in Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 until 1981), and its platform partner, the Grand Ville

Pontiac Grand Ville

The Pontiac Grand Ville was the top-trim model in the division's full-sized line from 1971 to 1975. It displaced the Pontiac Bonneville which had served as Pontiac's top-trim model since 1958....

, are some of the largest Pontiacs ever built; in station wagon body styles they reached just over 19 feet (5.8 m) long, and were also some of the heaviest produced cars at the time (2.5 short tons, 5000 lb or 2,268 kg).
The Bonneville name first appeared in 1954 on a pair of bubble-topped GM Motorama

Motorama

The General Motors Motorama was an auto show staged by GM from 1949 to 1961. These automobile extravaganzas were designed to whet public appetite and boost automobile sales with displays of fancy prototypes, concept vehicles and other special or halo models. Motorama grew out of Alfred P. Sloan's...

 concept car

Concept car

A concept vehicle or show vehicle is a car made to showcase new styling and or new technology. They are often shown at motor shows to gauge customer reaction to new and radical designs which may or may not have a chance of being produced....

s called the Bonneville Special

Pontiac Bonneville Special

The Pontiac Bonneville Special is a purpose-built concept car unveiled at the General Motors Motorama in 1954, the first 2-seater sports car Pontiac ever produced. Designed by renowned designer Harley J. Earl and hand built by Homer C. LaGassey Jr...

.