Jordanes (/dʒɔːrˈdeɪniːz/; Greek: Ιορδάνης), also written as Jordanis or Jornandes, was a 6th-century Eastern Roman bureaucrat, of Gothic descent, who became a historian later in life.

He wrote two works, one on Roman history (Romana) and the other on the Goths (Getica). The latter, along with Isidore of Seville's Historia Gothorum, is one of only two extant ancient works dealing with the early history of the Goths. Other writers, such as Procopius, wrote works on the later history of the Goths. Getica has been the object of much critical review. Jordanes wrote in Late Latin rather than the classical Ciceronian Latin. According to his own introduction, he had only three days to review what Cassiodorus had written and so he must also have relied on his own knowledge.

Jordanes writes about himself:

The Sciri, moreover, and the Sadagarii and certain of the Alani with their leader, Candac by name, received Scythia Minor and Lower Moesia. Paria, the father of my father Alanoviiamuth (that is to say, my grandfather), was secretary to this Candac as long as he lived. To his sister's son Gunthigis, also called Baza, the Master of the Soldiery, who was the son of Andag the son of Andela, who was descended from the stock of the Amali, I also, Jordanes, although an unlearned man before my conversion, was secretary.

Paria was Jordanes's paternal grandfather. Jordanes writes that he was secretary to Candac, dux Alanorum, an otherwise unknown leader of the Alans.

Jordanes was asked by a friend to write Getica as a summary of a multi-volume history of the Goths by the statesman Cassiodorus that existed then but has since been lost. Jordanes was selected for his known interest in history and because of his own Gothic background. He had been a high-level notarius, or secretary, of a small client state on the Roman frontier in Scythia Minor, modern southeastern Romania and northeastern Bulgaria.

Jordanes was notarius, or secretary to Gunthigis Baza, a nephew of Candac and a magister militum of the leading Ostrogoth clan of the Amali.

That was ante conversionem meam ("before my conversion"). The nature and the details of the conversion remain obscure. The Goths had been converted with the assistance of Ulfilas (a Goth), made bishop on that account. However, the Goths had adopted Arianism. Jordanes's conversion may have been a conversion to the trinitarian Nicene Creed, which may be expressed in anti-Arianism in certain passages in Getica. In the letter to Vigilius he mentions that he was awakened vestris interrogationibus – "by your questioning".