| Mareuil-sur-Aÿ | |
| Type: | Delegated commune |
| Image Coat Of Arms: | Blason ville fr Mareuil-sur-Ay (Marne).svg |
| Arrondissement: | Épernay |
| Canton: | Ay |
| Insee: | 51347 |
| Postal Code: | 51160 |
| Commune: | Aÿ-Champagne |
| Coordinates: | 49.048°N 4.0319°W |
| Elevation M: | 89 |
| Area Km2: | 11.48 |
| Population: | 1113 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Mareuil-sur-Ay (pronounced as /fr/, literally Mareuil on Ay) is a former commune in the Marne department in north-eastern France. Since January 2016, Mareuil-sur-Aÿ is part of the administrative commune Aÿ-Champagne.[2] Its population was 1,113 in 2019.[1]
The patron saint is Saint Trésain.
Its vineyards are located in the Vallée de la Marne subregion of Champagne, and are classified as Premier Cru (99%) in the Champagne vineyard classification. Together with Tauxières-Mutry it is the highest rated of the Premier Cru villages, and has therefore just missed out on Grand Cru (100%) status.thumb|left|Château Montebello. Regardless, the vineyards, harvest huts, presses, and cellars in Mareuil-sur-Ay were inscribed on the UNESCO World Heritage List in 2015 as part of the Champagne hillsides, houses and cellars site, because of the region's testimony to the development of champagne.[3]