The Stanley Motor Carriage Company was an American manufacturer of steam cars that operated from 1902 to 1924, going defunct after it failed to adapt to competition from rapidly improving Internal combustion engine vehicles. The cars made by the company were colloquially called Stanley Steamers although several different models were produced.

A steam car is a car (automobile) propelled by a steam engine. A steam engine is an external combustion engine (ECE), whereas the gasoline and diesel engines that eventually became standard are internal combustion engines (ICE). ECEs have a lower thermal efficiency, but carbon monoxide production is more readily regulated.