"Euthyphro" is a philosophical dialogue written by Plato, set in the Athens of the 5th century BC. The dialogue takes place outside the courthouse, where Socrates meets Euthyphro, a young man who claims to have a deep knowledge of piety and holiness. Euthyphro has come to prosecute his own father for the murder of a slave, whom he believed was guilty of impiety.

Socrates questions Euthyphro about his understanding of piety and holiness, and the dialogue becomes a profound exploration of the nature of these concepts. Socrates challenges Euthyphro's definition of piety and holiness, and ultimately concludes that he does not have a clear understanding of what these concepts mean.

Throughout the dialogue, Plato raises important questions about the nature of ethics, the relationship between religion and morality, and the limits of human knowledge. "Euthyphro" remains a classic work of philosophy, renowned for its clear and rigorous approach to philosophical inquiry.