International Harvester S-Series
 The International Harvester S-Series was a medium and heavy-duty truck line manufactured by International Harvester. S-Series was first used as a label for the 1956 and 1957 Light Line trucks until replaced by the A-series for 1958. The S-series label was reintroduced in mid-1977 as a replacement for the International Harvester Fleetstar. In 1979 other versions of the S-Series were introduced to succeed the Loadstar-series.