ET1

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