1909 in Argentine football saw Alumni win the championship, their 8th title in 10 seasons. Argentina won all three international trophies contested against Uruguay.
The 1909 championship featured 10 teams, with each team playing the other twice. River Plate made its debuts at the top division while Lomas AC and Reformer were relegated, being the first teams in the history of Primera División to be relegated under the new system.
(*) During this edition Estudiantes (BA) set a record that persists nowadays, beating Lomas AC by 18-0. Moreover, Maximiliano Susan scored 12 goals, 7 of them within 20 minutes.
Argentina retained both Copa Lipton and Copa Newton in 1909 and won the Copa Premier Honor Argentino for the first time.