The Lioré et Olivier LeO H-23 was a French military flying boat, primarily intended for coastal reconnaissance, though able to carry a small bomb load.

The bottom had a single, small step and was relatively flat-bottomed and without a sharp central V-form cross-section, rather having gentle double curvature flattening towards the chines.

On each side an unstepped metal float was mounted from two pairs of parallel struts at the outer end of the wing centre-section to stabilise the aircraft on water.

[1] The LeO H-23 was powered by a 450 kW (600 hp) Hispano-Suiza 12N tractor configuration water-cooled V-12 engine, strut-mounted high above the wing and the cockpit.

Two small, streamlined structures, each close to the fuselage side a little above the waterline and mounted on a pair of parallel struts from the forward wing spar, carried the undercarriage legs, a vertical shock absorber and a trailing arm meeting at the wheel axle, which could be rotated together to a horizontal position for touchdowns on water.

It was judged worth further testing and after some hull modifications it was transferred to Bizerte in the then French colony of Tunisia for full evaluation but was lost in an accident after logging 83 hours of flight.