Saint-Cyr-au-Mont-d'Or (French pronunciation: [sɛ̃siʁ o mɔ̃dɔʁ]; Arpitan: Sant-Ciro-en-Mont-Tor) or simply Saint-Cyr is a commune in the Metropolis of Lyon in the Auvergne-Rhône-Alpes region, central-eastern France.

It is a northern suburb of Lyon, bordering its 9th arrondissement.

It is one of the richest communities in the Lyon Metropolis with a median household income of €89,819 per year.

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