Heliodorus of Emesa (Medieval Greek ? ) was a Byzantine writer for whom two ranges of dates are suggested, either about the 250s AD or in the aftermath of Emperor Julian's rule, that is shortly after 363. He is known for the ancient Greek novel called the Aethiopica () ("Ethiopian Story"), sometimes called "Theagenes and Chariclia" (Greek: ).
According to his own statement, his father's name was Theodosius and he belonged to a family of priests of the sun. The 5th-century Socrates of Constantinople identifies the author of the Aethiopica with a Heliodorus, bishop of Trikka, but the name Heliodorus was a common one. In the 14th century, Nikephoros Kallistos Xanthopoulos expanded this narrative, relating that the work was written in the early years of this bishop before he became a Christian and that, when forced either to disown it or resign his bishopric, he preferred resignation. Most scholars reject this identification.
Other ancient Greek novelists: