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Gnome et Rhône was a major French aircraft engine manufacturer. Between 1914 and 1918 they produced 25,000 of their 9-cylinder Delta and Le Rhône 110 hp (81 kW) rotary designs, while another 75,000 were produced by various licensees.
Louis Seguin and his brother Laurent started development of one of the first purpose-designed aircraft engines, combining several Gnome cylinders into a rotary engine. The design emerged in the spring of 1909 as the 7-cylinder rotary Gnome Omega, delivering 50 hp (37 kW) from 75 kg. More than 1,700 of these engines would be built in France, along with license-built models in Germany, Sweden, Britain, the United States and Russia.
Another French engineer, Louis Verdet, designed his own small rotary engine in 1910 which did not see much use. In 1912 he delivered a larger 7-cylinder design, the 7C, which developed 70 hp from 90 kg. This proved much more popular and he formed Société des Moteurs Le Rhône later that year. He soon followed the 7C with the larger Le Rhône 9C, a nine-cylinder design delivering 80 hp (60 kW).
After several years of fierce competition, Gnome and Le Rhône finally decided to merge. Negotiations started in 1914, and on 12 January 1915 Gnome bought out Le Rhône to form Société des Moteurs Gnome et Rhône. Developments of the 9C continued to be their primary product, improving in power to about 110 hp (80 kW) in the Le Rhône 9J by the end of the war. The 9-series was the primary engine for most early-war designs both in French and British service as well as in Germany where, perhaps somewhat ironically, Oberursel had taken out a license just before the war.

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