Pierre Manhès (1841 – 1906) was a French metallurgist and businessman, who succeeded in 1880 to adapt the Bessemer process to the pyrometallurgy of the copper.

With his engineer Paul David (metallurgist) [fr], he developed the Manhès-David process and converter, which were widely adopted, mainly in the United States.

In 1883, under license to use the patented process Franklin Farrel introduced the Manhes-David furnace at the Parrot smelter in Butte, Montana.

Before the adoption of the process, copper mines in the Western United States produced only matte, which required further, costly purification steps in east coast refineries.

The Manhes-David step increased the purity of copper metal produced at the Western mine site, up to 99%, and more with the addition of the electrolysis process by the end of the century.