Riom-ès-Montagnes (French pronunciation: [ʁjɔ̃ ɛs mɔ̃taɲ]; Occitan: Riòm de las Montanhas) is a commune in the Cantal department in south-central France.

Main town of the "Pays Gentiane", the city is located northwest of the department of Cantal, in the heart of the regional natural park of Auvergne Volcanoes.

It flows into Petite Rhue, which marks the boundary between Riom-ès-Montagnes and the neighboring towns of Marchastel and Saint-Amandin.

Once very used, rail transport is still active thanks to the Gentian express, touristic train that circulates in Haute-Auvergne, stops in Riom-ès-Montagnes station and partially takes the old line of Bort-les-Orgues to Neussargues .

Louis Bonnet, creator of the "Auvergnat de Paris" was a forerunner in what is nowadays called "organized trips".

Its creation dates back to the ancient Gallo-Roman era as evidenced by the very name of the city, the Gaulish "rigomagos" meaning the king's market.

The town accounts above 100 merchants and artisans and the central administration employs around 100 people as well (Post office, Public Finance...) Riom has about fifty farmers.