Hybrid boat comprising an internal combustion engine provided with a reversing device to allow at least one condition of forward movement and one of reverse movement of the boat, transmission means connected between said reversing device and a propeller or impeller, wherein said transmission means comprise a transfer box having a first inlet, a second inlet and a single outlet, and a first drive shaft interposed between said reversing device and said first inlet and a second drive shaft interposed between said single outlet and said propeller or impeller, and an electric motor operatively connected with said second inlet, wherein said transfer box comprises means for selectively connecting said internal combustion engine and/or said electric motor with said single outlet.