Ancient Greek comedy was one of the final three principal dramatic forms in the theatre of classical Greece (the others being tragedy and the satyr play). Athenian comedy is conventionally divided into three periods, Old Comedy, Middle Comedy, and New Comedy. Old Comedy survives today largely in the form of the eleven surviving plays of Aristophanes, while Middle Comedy is largely lost, i.e. preserved only in relatively short fragments in authors such as Athenaeus of Naucratis. New Comedy is known primarily from the substantial papyrus fragments of Menander. The philosopher Aristotle wrote in his Poetics (c. 335 BC) that comedy is a representation of laughable people and involves some kind of blunder or ugliness which does not cause pain or disaster.C. A. Trypanis wrote that comedy is the last of the great species of poetry Greece gave to the world.

The Alexandrine grammarians, and most likely Aristophanes of Byzantium in particular, seem to have been the first to divide Greek comedy into what became the canonical three periods: Old Comedy (archaia), Middle Comedy (mese) and New Comedy (nea). These divisions appear to be largely arbitrary, and ancient comedy almost certainly developed constantly over the years.

Ancient Greek is the stage of the Greek language in the periods spanning the times c. 9th – 6th centuries BC, (known as Archaic), c. 5th – 4th centuries BC (Classical), and the c. 3rd century BC – 6th century AD (Hellenistic) of ancient Greece and the ancient world; being predated in the 2nd millennium BC by Mycenaean Greek. The language of the Hellenistic phase is known as Koine (common) or Biblical Greek, the language from the late period onward has no considerable difference from Medieval Greek. Koine is regarded as a separate historical stage of its own, although in its earlier form it closely resembles the Classical. Prior to the Koine period, Greek of the classic and earlier periods included several regional dialects.

Ancient Greek was the language of Homer and of classical Athenian historians, playwrights, and philosophers. It has contributed many words to English vocabulary and has been a standard subject of study in educational institutions of the West, since the Renaissance. This article's primary concern is the Epic and Classical phases of the language.