ERT begun in 1938 as radio station under the name EIR (National Radio Foundation), [Greek: ΕΙΡ (Εθνικόν Ιδρυμα Ραδιοφωνίας)]. EIR was one of 23 founding broadcasting organisations of the European Broadcasting Union (EBU-UER) in 1950.
First television broadcast steps were made in 1965. In 1970 EIR renamed to EIRT (National Radio and Television Foundation), [Greek: ΕΙΡT (Εθνικόν Ιδρυμα Ραδιοφωνίας-Τηλεοράσεως)]. By that time there were only two public TV services ERT and TED (Armed Forces Television), [Greek: ΤΕΔ (Τηλεόρασις Ενόπλων Δυνάμεων)], that was under the control of the Greek Army. In 1972 TED changed its name to YENED (Armed Forces Information Service), [Greek: ΥΕΝΕΔ (Υπηρεσία Ενημερώσεως Ενόπλων Δυνάμεων)]. YENED became ERT 2 in 1982 .
In 1976 EIRT changes its name to ERT.
On July 26, 2013 ERT ceased its operation and became DT (Public Television), [Greek: ΔΤ (Δημόσια Τηλεόραση)]. On May 4, 2014, the name changed again to NERIT (New Hellenic Radio, Internet & Television), [Greek: ΝΕΡΙΤ (Νέα Ελληνική Ραδιοφωνία, Ίντερνετ και Τηλεόραση)]. On June 11, 2015 the name changed back to ERT.