The AS-20 (Type 5110) was a French air-to-surface missile developed during the late 1950s.

The AS-20 was based on an earlier Nord Aviation air-to-air missile the AA.20 (designated Type 5103).

Only minor changes were required to make it an air-to-surface missile, the size of the warhead was increased as a result of replacing the large proximity fuze with a simple impact fuze.

The AS-20 had four steeply swept-back fins, cruciform in cross-section around the midsection of its body.

It used a dual-thrust solid rocket motor, which exhausted through two large nozzles during the boost stage, and a single center line nozzle during the sustain stage.