Stewart Motor Corporation, produced in the United States from 1912 to 1939, was a commercial vehicle manufacturer based in Buffalo, New York, founded by Thomas R. Lippard and Raymond G. Stewart. The company specialized in medium and heavy-duty trucks, offering models ranging from ¾-ton to 4-ton capacities for freight, industrial, and commercial use. Stewart trucks earned a reputation for durability and practical engineering, serving American businesses through the 1910s, 1920s, and 1930s. Characterized by rugged construction and a focus on commercial transportation, the company ceased operations in 1939.