De Schelde S.21
| S.21 | |
|---|---|
| Role | Fighter aircraft | 
| National origin | Netherlands | 
| Manufacturer | NV Koninklijke Maatschappij De Schelde | 
| Status | Project abandoned | 
| Number built | 1 incomplete prototype | 
The De Schelde S.21 was a proposed Dutch fighter of the late 1930s and early 1940s. It was a single-seat, single-engined, pusher monoplane. A single prototype was under construction in 1940, but work was abandoned due to the German invasion.