4th century BCE) of Miletus was a philosopher of the Megarian school who is famous for his paradoxes.

According to Diogenes Laërtius, Eubulides was a pupil of Euclid of Megara,[1] the founder of the Megarian school.

The second, third and fourth paradoxes are variants of a single paradox and relate to the problem of what it means to "know" something and the identity of objects involved in an affirmation (compare the masked-man fallacy).

[9] These paradoxes were very well known in ancient times, some are alluded to by Eubulides' contemporary Aristotle[10] and even partially by Plato.

[9] Aulus Gellius mentions how the discussion of such paradoxes was considered (for him) after-dinner entertainment at the Saturnalia,[12] but Seneca, on the other hand, considered them a waste of time: "Not to know them does no harm, and mastering them does no good.