Pontoon may refer to:* Pontoon (game), the Australian/Malaysian casino game Pontoon (card game), a chiefly British version of the card game blackjack (also known as vingt-et-un or 21) Pontoon (boat), the flat-bottomed boat, or floats used to support a structure on water Pontoon effect, the tendency of pontoons to capsize when a heavy load with a high centre of gravity is placed on it Pontoon bridge, a bridge that floats on pontoons Ponton (automobile), the car body style Pontoon fenders, the fen… (More on Pontoon)