Aita Mare (Hungarian: Nagyajta, Hungarian pronunciation: [nɒɟɒjtɒ]) is a commune in Covasna County, Transylvania, Romania, composed of two villages: Aita Mare and Aita Medie (Középajta).
It formed part of the Székely Land region of the historical Transylvania province.
The commune has an absolute Székely Hungarian majority.
At the 2011 census, Aita Mare had a population of 1,715, of which 90.15% were Hungarian and 8.8% Romanian.
At the 2021 census, the commune had a population of 1,626, of which 90.65% were Hungarian and 7.63% Romanian.