Aÿ-Champagne (French pronunciation: [aj ʃɑ̃paɲ]) is a commune in the Marne department, northern France.

The municipality was established on 1 January 2016 and consists of the former communes of Aÿ, Mareuil-sur-Ay, and Bisseuil.

The population data given in the table below refer to the commune in its geography as of January 2020.

Aÿ's vineyards are located in the Vallée de la Marne subregion of Champagne, and are classified as Grand Cru (100%) in the Champagne vineyard classification.

Many prestigious Champagne houses own vineyards in the immediate vicinity, and several producers are located in Aÿ, including Ayala and Bollinger.