Hegelochus (, fl. 408 BC) was an Ancient Greek actor active in Athens in the 5th century BC, best remembered for a slight pronunciation mistake that derailed his career.
Hegelochus acted in the play by Euripides when it was performed in the City Dionysia dramatic festival in 408 BC. He was playing the title role of Orestes. In line 279 of the play, instead of "after the storm I see again a calm sea" (, ), Hegelochus recited "after the storm I see again a weasel" (, ).
In the nominative, the adjective forms that give "calm sea" are (), and "weasel" is either or (). The accusative plural of is (), which, after apocope, results in ; the accusative of is ()." This can be explained by his running out of breath and failing to make the elision. Moreover, the weasel was an unlucky animal, contrasting with the optimistic intent of the line.
The error was mocked by Sannyrion in his Danae, in Aristophanes' The Frogs, by the comic poet Plato, and by Strattis in his The Human Orestes (), (), and ().