The Ralph Lucas was an English automobile manufactured from 1901 until around 1908.

The first model was an odd two-stroke car powered by paraffin; it had a piston and a crankshaft at either end of its one cylinder. A button in the steering wheel controlled the speed of the engine.

The coachwork was of pressed steel. The two-stroke design introduced in 1908 was the origin of the Valveless.