Navistar International Corporation (formerly International Harvester Company) is an American holding company, that owns the manufacturer of International brand commercial trucks, IC Bus school and commercial buses, Workhorse brand chassis for motor homes and step vans, and is a private label designer and manufacturer of diesel engines for the pickup truck, van, and SUV markets. The company is also a provider of truck and diesel engine parts and service.

Headquartered in Lisle, Illinois, Navistar has 16,500 employees and a 2013 annual revenue of $10.775 billion. The company's products, parts, and services are sold through a network of nearly 1,000 dealer outlets in the United States, Canada, Brazil, and Mexico and more than 60 dealers in 90 countries throughout the world. The company also provides financing for its customers and distributors principally through its wholly owned subsidiary, Navistar Financial Corporation.