Ephorus of Cyme ( ; Ephoros; c. 400 – 330 BC), often named in conjunction with his birthplace Cyme, Aeolia, was an ancient Greek historian. Information on his biography is limited; he was the father of Demophilus, who followed in his footsteps as a historian, and to Plutarch's claim that Ephorus declined Alexander the Great's offer to join him on his Persian campaign as the official historiographer. Together with the historian Theopompus, he was a pupil of Isocrates, in whose school he attended two courses of rhetoric. But he does not seem to have made much progress in the art, and it is said to have been at the suggestion of Isocrates himself that he took up literary composition and the study of history.

Ephorus of Cyme ( ; Ephoros; c. 400 – 330 BC), often named in conjunction with his birthplace Cyme, Aeolia, was an ancient Greek historian. Information on his biography is limited; he was the father of Demophilus, who followed in his footsteps as a historian, and to Plutarch's claim that Ephorus declined Alexander the Great's offer to join him on his Persian campaign as the official historiographer. Together with the historian Theopompus, he was a pupil of Isocrates, in whose school he attended two courses of rhetoric. But he does not seem to have made much progress in the art, and it is said to have been at the suggestion of Isocrates himself that he took up literary composition and the study of history.