Aeronaut (Estonian: Eesti Õhusõidu Aktsiaselts Aeronaut) was an Estonian airline which existed between 1921 and 1928. It was the first Estonian airline.
The company operated the following routes: Tallinn–Helsinki, Tallinn–Stockholm, Tallinn–Riga–Königsberg and Tallinn–Tartu–Viljandi–Pärnu.