The term 2+2 (pronounced "two plus two") is a phrase used to describe the configuration of a car with seating for two passengers in the front, plus two smaller seats for occasional passengers (or children) in the rear.

2+2s have only two rear seats rather than the more common three. Reasons for this include the fact that they may be sporty in nature and typically have a low roof line, wide wheel arches, and/or (because of being front engined with rear-wheel drive or four-wheel drive) wide central transmission tunnels, the last of these being the most pressing problem for a third (middle) seat. The Porsche 911 is a rear engined, rear wheel drive, so lacks a large transmission tunnel, but loses space in the rear due to its wheel arches, reducing the space to 2 passengers.

Space in the rear is most noticeably absent in terms of longitudinal leg-room. This is again often due to the low roof line, and other elements of body styling, in addition to large engine compartments and sometimes also large areas given over to the convertible roof in the case of a 2+2 convertible.

Many vehicles may fall into the definition, and there is no official body offering a strict definition, but cars called 2+2s tend to have:

only space for a maximum of 2 rear passengers rather than 3;
a more sporting nature than the average vehicle;
coupé bodies;
two doors.
Many convertible, targa top and hatchback cars are strictly within this definition, but are rarely deemed 2+2s.