The Orion-class submarines were a class of two submarines built for the French Navy between 1928 and 1931.
The Orion-class submarines were ordered in 1928 to a Loire-Simonot design. long, with a beam of and a draught of , they could dive up to . The submarines had a surfaced displacement of and a submerged displacement of . Propulsion while surfaced was provided by two diesel engines with a total of and two electric motors with a total of . The submarines' electrical propulsion allowed it to attain speeds of while submerged and on the surface. Their surfaced range was at with a submerged range of at .