Final answer:
Sophocles was the Greek playwright who wrote Oedipus Rex.
Step-by-step explanation:
The Greek playwright who wrote Oedipus Rex was Sophocles. He was a younger contemporary of Aeschylus and wrote a large number of plays, of which seven have survived. His best-known works include Oedipus Rex and Antigone. Sophocles is also known for his dramatic innovations, such as increasing the number of chorus members and adding a third actor.