A universal boat propulsion system is provided for a boat that is defined in a length direction, a width direction, and a depth direction. The universal boat propulsion system includes a support assembly that spans the boat in the width direction, a clamping assembly that secures the support assembly on the boat, and a pair of shafts coupled to respective opposite ends of the support assembly. Each shaft in the pair of shafts extends in a depth direction. A pair of propulsion devices produce thrust to propel the boat. Each propulsion device in the pair of propulsion devices is supported by a respective one of the shafts. A user input device controls operation of the pair of propulsion devices.