The Borel Hydro-monoplane (also called Bo.8[1]) was a French seaplane produced in 1912.

The rectangular section fuselage tapered to a vertical knife-edge at the rear: at the front the longerons on each side were curved inwards, meeting at the front engine bearer.

Tail surfaces consisted of a narrow-chord fixed horizontal surface with a much broader elevator with horn balances hinged to the trailing edge and a balanced rudder which extended below the sternpost and carried a small float.

The main undercarriage consisted of a pair of unstepped flat-bottomed floats.

[2] An example was entered in the 1913 Schneider Trophy competition, but crashed during the elimination trials.