The CAMS 31 was a 1920s French single-seat fighter biplane flying-boat designed and built by Chantiers Aéro-Maritimes de la Seine (CAMS).

[1] The CAMS 31 was a wooden-built two-bay equal span biplane with stabilising floats under each wing and an open cockpit forward of the lower-wing for the pilot.

[1] The CAMS 31 was armed with two fixed hull-mounted Vickers machine-guns in the bow.

[1] Testing proved the flying-boats handled well but were just not suitable as fighters and no more were built.

[1] A mail carrying postal variant was designated CAMS 31P Data from [1]General characteristics Performance Armament