Dionysius of Halicarnassus (Διονύσιος Ἀλεξάνδρου Ἁλικαρνασσεύς,
Dionúsios Alexándrou Halikarnasseús; 60 BC – after 7 BC) was a Greek historian and teacher of rhetoric, who flourished during the reign of Emperor Augustus. His literary style was atticistic – imitating Classical Attic Greek in its prime.
Dionysius' opinion of the necessity of a promotion of paideia within education, from true knowledge of classical sources, endured for centuries in a form integral to the identity of the Greek elite.
He was a Halicarnassian. At some time after the end of the civil wars he moved to Rome, and spent twenty-two years studying Latin and literature and preparing materials for his history. During this period, he gave lessons in rhetoric, and enjoyed the society of many distinguished men. The date of his death is unknown. In the 19th century, it was commonly supposed that he was the ancestor of Aelius Dionysius of Halicarnassus.