Editing Dewoitine D.520 (section)

===Direct derivatives===
In 1940, SNCAM had several projects to fit the D.520 airframe with more powerful engines. These developments were halted by the June armistice.<ref>Belcarz 2005, p. 8.</ref>
;D.521
:engine replaced by a [[Rolls-Royce Merlin]] III, one example was built, but the project was cancelled.
;D.522
:engine replaced by an [[Allison V-1710]] C-1, project abandoned after the armistice (22 June 1940).
;D.523
:engine replaced by slightly different sub-variants of the {{cvt|820|kW}} [[Hispano-Suiza 12Y]]-51, with Szydlowski-Planiol [[supercharger]]. D.523 Prototype was completing pre-production trials in June 1940.
;D.524
:Version powered by [[Hispano-Suiza 12Y|Hispano-Suiza 12Y-89ter]] engine. One prototype built, but it never flew.
;D.525
:development version of the D.523
;D.530
:planned version with a {{cvt|1044|kW}} Rolls-Royce Merlin or a {{cvt|1342|kW}} [[Hispano-Suiza 12Y]].