International Harvester S-Series (bus chassis)
 The International S-Series Schoolmaster was a Type C (conventional) bus chassis manufactured by International Harvester which became Navistar during its production run. It was introduced in 1979 as the replacement for the Loadstar bus chassis; it was used for both school bus and commercial bus applications. In 1989 it was replaced by the International 3800; both chassis were offered that year. The Schoolmaster was the last bus chassis designed by International Harvester.