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ET1 or ET-1 may refer to

  • ET1 (Greece) the first channel from Ellinikí Radiofonía Tileórasi (ERT), the Hellenic Broadcasting Corporation
  • ET-1, a planet orbiting star HD 102195
  • Electronics Technician 1st Class (ET1), a US Navy enlisted rating
  • Endothelin 1, a peptide playing important role in vascular haemostasis