Oedipus the King (often known by the Latin title Oedipus Rex) is an Athenian tragedy by Sophocles that was first performed c. 429 BC. It was the second of Sophocles's three Theban plays to be produced, but it comes first in the internal chronology, followed by Oedipus at Colonus and then Antigone. Over the centuries, it has come to be regarded by many as the Greek tragedy par excellence.

This is the final installment in Sophocles's Theban Plays, following Oedipus Rex and Oedipus at Colonus. Oedipus's daughter Antigone deliberately breaks the laws of Thebes when she buries her brother's body and is sentenced to death. She clashes with Creon, the King of Thebes, over what constitutes justice and morality: the laws of the state or the laws of the individual.