Ister

Ister, The Ister, or Der Ister may refer to:

• The Danube river, known as the Ister in Latin and Istros (Ἴστρος) in Ancient Greek and Thracian
• The Dniester river, known as the Ister in Thracian
• "Der Ister", a poem by Friedrich Hölderlin
  • Hölderlin's Hymn "The Ister", a lecture course delivered by Martin Heidegger in 1942
• Ister-class frigate, a group of screw frigates ordered for the Royal Navy in the early 1860s
• The Ister (film), a 2004 film directed by David Barison and Daniel Ross
• Tajuria ister, a butterfly of the family Lycaenidae
• Ister of Cyrene (fl. 240s BC), Greek historian