Jacque Jules Garnier (25 November 1839 in Saint-Étienne[1] – 8 March 1904 in Gorbio) was a French engineer and industrialist.

Upon leaving the School of Mines of Saint-Étienne , he worked for two years at the Steelworks of the Navy and the Railways, then carried out a geological study in Sardinia in 1862.

He experimented with one of his inventions, torpedoes (50 kg) fueled by flash cotton, with effects as devastating as they were useless in a war lost too quickly.

Several trips to North America and Canada with his son Gilbert Garnier allow him to demonstrate his patents and processes.

Since the nickel steel industry is developing, mining companies in Canada work with Jules Garnier because of his reputation.

He created entire plants as consulting engineer for the Canadian Copper Company (forerunner of the Inco mining group).