Heenan & Froude was a United Kingdom-based engineering company, founded in Newton Heath, Manchester, England in 1881 in a partnership formed by engineers Richard Froude and Richard Hammersley Heenan. Expanded on the back of William Froude's patent for inventing the water brake dynamometer, their most famous creation was the 518 feet (158 m) high Blackpool Tower.

The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. While basing his design on automotive valves, Caprotti made several significant departures from this design to adapt the valves for steam. Having agreed a joint-venture with Worcester-based engineering company Heenan & Froude from 1938, Heenan & Froude fully acquired Caprotti post-World War II in 1947.