| Mesnil-sur-Oger | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Le Mesnil-sur-Oger.svg |
| Arrondissement: | Épernay |
| Canton: | Vertus-Plaine Champenoise |
| Insee: | 51367 |
| Postal Code: | 51190 |
| Mayor: | Pascal Launois[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Épernay, Coteaux et Plaine de Champagne |
| Coordinates: | 48.9472°N 4.0225°W |
| Elevation M: | 119 |
| Area Km2: | 7.91 |
Le Mesnil-sur-Oger (in French pronounced as /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.