Erebia cassioides (common brassy ringlet) is a member of the Satyrinae subfamily of Nymphalidae. It is found in the Balkans, the eastern and western Alps, central Italy, the Pyrenees and the Cantabrian mountains. It is found on altitudes between 1,600 and 2,600 meters. The wingspan is 32–38 mm. The larvae feed on various grasses, including Gramineae species.