Kenworth is an American manufacturer of medium and heavy-duty Class 8 trucks with offices based in Kirkland, Washington, a suburb of Seattle. Kenworth is one of three major truck divisions and brands under parent company PACCAR.

Kenworth was founded in Portland, Oregon as a car and truck dealership known as Gerlinger Motor Car Works. In 1914, Gerlinger decided to build their own truck with a more powerful inline six-cylinder engine, the first put into a commercial truck. The Gersix, as it was known when introduced in 1915 was framed in structural steel, which along with its power, made the truck ideal for logging in the rugged North-West. 

In 1916 the company moved to Tacoma, Washington and in 1917 was bought by Seattle businessman Edgar K. Worthington and his partner Captain Frederick Kent, renaming it the Gersix Motor Co. In 1919 Kent retired from the business, and his son Harry Kent became Worthington’s new partner.

 In 1922, Gersix made 53 trucks which were assembled in individual bays rather than on a conventional assembly line.

In 1923 Kent and Worthington reincorporated the business as the Kenworth Motor Truck Company, a combination of the names “Ken” and “Worth”.

In 1933 Kenworth was the first American company to offer diesel engines as standard in their trucks. 

In 1945 Kenworth was bought by The Pacific Car and Foundry Company (PACCAR).

The 1970s television series “Movin On” featured a Kenworth tractor. In the 1989 James Bond movie “Licence to Kill”, Bond drives a Kenworth W900B semi-truck as he duels drug dealer Franz Sanchez.

Current Class 8 production includes the T680, T800, T880, W900, W990 and C500B (off-road).