A limousine (or limo) is an unusually long luxury car, traditionally black or white in color (other colors, however, have also been used for limousines, such as pink, magenta, or blue). Limousines are most commonly driven by chauffeurs and are often associated with the wealthy.

While some limousines are owned by individuals, many are owned by governments to transport senior politicians, by large companies to transport executives, or by broadcasters to transport guests Most limousines, however, operate as livery vehicles, providing up market competition to taxicabs.

The word limousine is derived from the name of the French region Limousine, and is associated with the long cloaks once worn by the shepherds there.

A limousine typically has a partition between the driver compartment and the rear passenger compartment. This partition usually contains a sliding (sometimes even soundproof) glass window so that conversations between passengers in the rear compartment may be kept private from the chauffeur.

Traditionally, the limousine has been an extension of a large sedan. A longer frame and wheelbase allow the rear passenger compartment to contain the usual forward facing passenger seat but with a substantial amount of foot room — more than is actually needed. Usually then two "jump seats" are mounted, facing rearward behind the driver. These seats fold up when not in use. In this way, up to five persons can be carried in the aft compartment in comfort, and up to two additional persons carried in the driver's compartment, for a total capacity of seven passengers in addition to the driver. This type of seat configuration has however become less popular in recent limousines.

Newer limousines such as the Maybach 62, Audi A8L, Mercedes-Benz S-Class, Hummer H2, Leyland Miracle, BMW 760li, Lincoln Town Car, L Edition, and the Cadillac DTS do not feature such seats since stretch limousines are usually used to transport more than three passengers, excluding the driver. In production American limousines however, the jump seats almost always faced forward. The last production limousine, by Cadillac, with forward facing jump seats was in 1987, the last Packard in 1954, and the last Lincoln in 1939, though Lincoln has offered limos through their dealers as special order vehicles from time to time. Vehicles of this type in private use may contain expensive audio players, televisions, video players, and bars, often with refrigerators.

It is simpler and more straightforward to determine the effects of altering a separate chassis than it is to determine the effects of altering a load-bearing unit body. For this reason, the automobile of choice for conversion into stretch limousines is currently the Lincoln Town Car, whose Panther platform is one of the last remaining automotive platforms using a separate load-bearing chassis. However, coachbuilders have recently built many new models based on SUVs with separate load-bearing chassis, including Hummer H2s and H3s.

A Lada "limousine" in Trinidad, Cuba Another type of vehicle modified for multiple passenger use is the motorized stage, applied to the same tasks as the earlier stagecoach. It is not considered a true limousine but rather in its design and application is between a sedan and a bus. While a bus will have a central interior aisle for access to seating, a stage has multiple doors that allow access to transverse forward facing seats. Examples of the type were constructed not only from sedans (e.g., Chrysler New Yorker, Cadillac DeVille), but also from station wagons; many of the station wagon conversions sported a large rack, running the length of the roof, for carrying the passengers' baggage.

This type of vehicle was once rather common in some locations. An example of its use was in the transport of travelers arriving by railroad at Merced, California to Glacier National Park and Yosemite National Park in the first half of the 20th century. In Glacier National Park, these were referred to as "Jammers" in reference to the nickname of their gear-jamming drivers. In Yosemite, passengers would then stay in rustic platform tent camps or more expensive lodges and hike or rent bicycles for movement around the park.

A modern version of the stage is seen in some novelty stretch Hummer or Hummer H2 vehicles. Some funeral homes maintain six-door stages to carry the family of the deceased between the church and the cemetery. These are usually not used for private hire.

Exotic limousines

A limousine based on a Ford Excursion Sometimes a coach builder or car designer will develop the "ultimate" stretch limo, adding amenities that are somewhat impractical but which make a significant design statement. One such design includes double rear axles to support the weight of an operational hot tub.

Coach builders can perform aftermarket extensions on luxury sedans and SUVs. These extensive limousine conversions have been performed on several luxury marques, including: Audi, Bentley, BMW, Cadillac, Chrysler, Ford, Holden, Hummer, Infiniti, Jaguar, Lexus, Lincoln, Mercedes-Benz, Rolls-Royce and Volkswagen. In the United States the most popular vehicles for stretch limousines conversion are the Lincoln Town Car, Cadillac DTS, Hummer H2, and the Lincoln Navigator. There are even instances of Corvettes and VW Bugs being stretched to accommodate up to 10 passengers.

Most custom coach builders are located in the United States and Europe and cater mainly to limousine companies. Few such vehicles are available for public hire. A typical price to buy a Lincoln Town Car sedan and have it stretched to hold 6 passengers is approximately USD $85,000 (at 2006 prices) depending on the additional features added into the vehicle. In addition to luxuries, security features such as armoring and bulletproof glass are available.