The 1918 Primera División was the seventh season of top-flight Peruvian football. A total of 14 teams competed in the league, The champion was Sport Alianza. It was organized by the homonymous entity, Liga Peruana de Football (Peruvian Football League), currently known as Professional Football Sports Association.
Club Sport José Gálvez requested a license from the Liga Peruana de Football to not participate in this season and Unión Miraflores did not participate, automatically descending in category to the Peruvian Segunda División.