The Hurel-Dubois HD.31, HD.32, and HD.34 were a family of civil aircraft produced in France in the 1950s, based on Maurice Hurel's high-aspect ratio wing designs.

Tests with the Hurel-Dubois HD.10 research aircraft had validated Hurel's ideas about the practicality of such wings, and the French government agreed to sponsor the construction of two prototypes of a medium-range airliner utilising this same principle.

None were actually built for Air France or Aigle Azur but the IGN continued to be interested in an aerial photography variant to replace the Boeing B-17 Flying Fortress the company was then using.

The Aeronatique Naval evaluated the HD.31 and the company proposed an anti-submarine warfare variant to meet a requirement for 100 aircraft but nothing materialised.

[1] Of the HD.31, HD.32, and HD.34 family, there have been two accidents, both involving Hurel-Dubois HD.32s; Data from Jane's All the World's Aircraft 1958–59[8]General characteristics Performance