Le Mesnil-sur-Oger (French pronunciation: [lə menil syʁ ɔʒe], literally Le Mesnil on Oger) is a commune in the Marne department in the Grand Est region in north-eastern France.

The village's vineyards are located in the Côte des Blancs subregion of Champagne, and are classified as Grand Cru (100%) in the Champagne vineyard classification.

On wine labels its name is often shortened to Le Mesnil.

A Clos-type vineyard in the village is the source of Krug's Clos du Mesnil.

This Marne geographical article is a stub.