Signal de Saint-André, Mountain summit in Monts du Lyonnais, France

Signal de Saint-André is a 934-metre summit on the main ridge of the Monts du Lyonnais, in the commune of Saint-André-la-Côte, 20 kilometres west of Lyon. Its rounded grassy top, with patches of scrub and bare branches, rises above a plain of villages and fields. A rough grey lichen-covered rock outcrops near the summit.

In 1744, cartographer César-François Cassini established a geodetic marker at this summit. This was part of his assignment to create the first detailed map of France.

The name "signal" comes from the stone marker that César-François Cassini had erected on the summit in 1744 for his survey of the kingdom of France; the marker still stands there today. The summit lies on the main ridge line of the Monts du Lyonnais, in the commune of Saint-André-la-Côte, 20 kilometres west of Lyon.

From the parking area on road D113, an 800-meter uphill walk reaches the summit following the marked GR7 hiking trail. The path is clearly marked and passes near the village of Saint-André-la-Côte.

The summit hosts one of 53 stations of the Agence nationale des fréquences (ANFR), used to monitor the radio spectrum and to locate transmitters by goniometric means. The station is a technical installation, not a visitor facility, so it is observed from a distance.