Coenonympha tullia, the large heath or common ringlet, is a butterfly in the family Nymphalidae. It flies in a variety of grassy habitats, including roadsides, woodland edges and clearings, prairies, bogs, and arctic and alpine taiga and tundra. It is a poor flyer, but can sometimes be found along ditches seeking new grounds. It is a holarctic species found in northern Europe and Asia and across North America. The species was first described by Otto Friedrich Müller in 1764.