The Fokker S.III was a biplane trainer aircraft of the 1920s.

It was of conventional configuration, seating the pilot and instructor in tandem, open cockpits.

The single-baywings were staggered and of unequal span.

In 1927, Fokker's US subsidiary, Atlantic Aircraft imported a single example, in an attempt to interest the US Army in the type, but this did not result in a sale.

The aircraft was eventually purchased by the Wright Aeronautical Corporation and used as an engine testbed until broken up in 1929.