The Whitbread Engine was a type of steam engine designed and built by the British engineering firm Whitbread & Co. in the late 19th century. The engine was used in a variety of industrial applications, including powering ships, locomotives, and stationary machinery. It was a two-cylinder compound engine with a single-acting cylinder and a double-acting cylinder. The design was notable for its simplicity and efficiency, and it was widely adopted in many industries.