Mack Trucks, Inc., is an American truck manufacturing company and a former manufacturer of buses and trolley buses. Founded in 1900 as the Mack Brothers Company, it manufactured its first truck in 1905 and adopted its present name in 1922. Mack Trucks is a subsidiary of AB Volvo, which purchased Mack along with its then parent company Renault Véhicules Industriels in 2000.
Founded originally in Brooklyn, in 1900, the company moved its headquarters to Allentown, Pennsylvania five years later, in 1905. The company remained in Allentown from 1905 until 2009. In 2009, the company relocated its headquarters to Greensboro, North Carolina. Mack products are produced in Lower Macungie, Pennsylvania, and Salem, Virginia, with all powertrain products produced in its Hagerstown, Maryland plant. Mack also maintains additional assembly plants in Pennsylvania, Australia, and Venezuela. The company also once maintained plants in Hayward, California and Oakville, Ontario, though both of these have been closed.