Saint-Victor-et-Melvieu (French pronunciation: [sɛ̃ viktɔʁ e mɛlvjø]; Languedocien: Sant Victor e Malviu) is a commune in the Aveyron department in southern France.

In the south of the Massif Central, in the southern half of the department of Aveyron, the commune of Saint-Victor-et-Melvieu is situated in the interior of natural regional park of the Grands Causses [fr].

The minimal altitude, with 262 meters, is localized at the extreme west, near the place called the May d'Entraygues, where the Tarn leaves the commune and enters that of Le Truel.

The maximal altitude with 689 or 694 meters[note 1] is a kilometer and a half to the northwest of the village of Saint-Victor, at the Puech de Luargues.

It is related to a very wild lake on its part downstream[clarification needed], of a maximum depth of 25 meters and a superficial one of 130 ha.