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The Theatre of Dionysus (or Theatre of Dionysos, Greek: Θέατρο του Διονύσου) is an ancient Greek theatre in Athens. It is built on the south slope of the Acropolis hill, originally part of the sanctuary of Dionysus Eleuthereus (Dionysus the Liberator). The first orchestra terrace was constructed on the site around the mid- to late-sixth century BC, where it hosted the City Dionysia. The theatre reached its fullest extent in the fourth century BC under the epistates of Lycurgus when it would have had a capacity of up to 25,000, and was in continuous use down to the Roman period. The theatre then fell into decay in the Byzantine era and was not identified, excavated and restored to its current condition until the nineteenth century.

The cult of Dionysus was introduced to Attica in the Archaic period with the earliest representation of the God dating to c. 580 BC. The City Dionysia (or Great Dionysia) began sometime in the Peisistratid era. and was reorganised during the Kleisthenic reforms of the 520s BC. The first dramatic performances likely took place in the Agora where it is recorded that the wooden bleachers set up for the plays (ikria) collapsed. This disaster perhaps prompted the removal of dramatic production to the Sanctuary of Dionysus on the Akropolis, which took place by the time of the 70th Olympiad in 499/496 BC. At the temenos the earliest structures were the Older Temple, which housed the xoanon of Dionysos, a retaining wall to the north and slightly further up the hill a circular terrace that would have been the first orchestra of the theatre. The excavations by Wilhelm Dörpfeld identified the foundations of this terrace as a section of polygonal masonry, indicating an archaic date. It is probable there was an altar, or thymele, in the centre of the orchestra. No formally constructed stone seating existed at this point; only ikria and the natural amphitheatre of the hill served as a theatron.

Besides the archaeological evidence, there is the literary testimonia of the contemporary plays from which there are clues as to the theatre's construction and scenography. For this earliest phase of the theatre there is the work of Aeschylus, who flourished in the 480–460s BC. The dramatic action of the plays does point to the presence of a skene or background scenery of some description, the strongest evidence of which is from the Oresteia that requires a number of entrances and exits from a palace door. Whether this was a temporary or permanent wooden structure or simply a tent remains unclear since there is no physical evidence for a skene building until the Periclean phase. However, the hypothesis of a skene is not contradicted by the known archaeology of the site. The Oresteia also refers to a roof from which a watchman looks out, a step to the palace and an altar. It is sometimes argued that an ekkyklema, a wheeled trolly, was used for the revelation of the bodies by Clytemnestra at line 1372 in Agamemnon, amongst other passages. If so it was an innovation of Aeschylus' stagecraft. However, Oliver Taplin questions the seemingly inconsistent use of the device for the dramatic passages claimed for it, and doubts whether the mechanism existed in Aeschylus' lifetime.

The substantial changes to the theatre in the late fifth century BC are conventionally called Periclean since they coincide with the completion of the Odeon of Pericles immediately adjacent and the wider Periclean building programme. However, there is no strong evidence to say the theatre's reconstruction was of the same group as the other works or from Pericles’ lifetime. The new plan of the theatre consisted of a slight displacement of the performance area northward, a banking up of the auditorium, the addition of retaining walls to the west, east and north, a long hall south of the skene and abutting the Older Temple and a New Temple which was said to have contained a chryselephantine sculpture of Dionysus by Alkamenes. The seating during this phase was probably still in the form of ikria but it may be the case that some stone seating had been installed. Inscribed blocks, displaced but preserved in the retaining walls, with fifth-century BC epigraphy on them might indicate dedicated or numbered stone seats. The use of breccia in the foundations of the west wall and the long hall gives a terminus ante quem of the early fifth century BC, and a likely date of the last half of that century when its use was becoming common. Also the last recorded statue of Alkamenes was 404 BC, again placing the works in the late 400s. Pickard-Cambridge argues that the reconstruction was piecemeal over the last half of the century into the period of Kleophon.

From the evidence of the plays there is a larger corpus to draw upon during this most vital period of Greek drama. Sophocles, Aristophanes and Euripides were all performed at the Theatre of Dionysus. From these we can deduce that stock sets may have been in use to meet the requirements of the plays such that the Periclean reconstruction included post-holes built into the terrace wall to provide sockets for movable scenery. The skene itself was likely unchanged from the theatre's earlier phase, with a wooden structure of at most two floors and a roof. It is also possible that the stage building would have had three doors, with two in the projecting side-wings or paraskenia. Mechane or geranos were used for the introduction of divine beings or flights through the air as in Medea or Aristophanes' Birds.

One point of contention has been the existence or otherwise of the prothyron or columned portico on a skene that represents the interior spaces of temples or palaces. It is a supposition partly supported by the texts, but also from vase painting believed to be depictions of plays. Aeschylus Choēphóroi 966 and Aristophanes' Wasps 800-4 both refer directly to a prothyron, while the parodos-chant in Euripides’ Ion makes indirect reference to one. The mourning Niobe loutrophoros in Naples and the Boston volute krater, for example, both depict a prothyron. Pickard-Cambridge questions if this was permanent structure since interior scenes were rare in tragedy. The evidence from the plays for the use of an ekkyklema in this period is ambiguous; passages such as Acharnians 407 ff or Hippolytus 170-1 suggest but don't require the device. The argument for its use depends largely on reference to the ekkyklema in later lexographers and scholiasts.

Lycurgus was a leading figure in Athenian politics in the mid- to late-fourth century prior to the Macedonian supremacy, and controller of the state's finances. In his role as epistate of the Theatre of Dionysus he was also instrumental in transforming the theatre into the stone-built structure seen today. There is a question of how far up the hill the stone theatron of this phase went; either all the way up to the rock of the Akropolis (the kataome) or only as far as the peripatos. Since the Choragic Monument of Thrasyllos of 320/319 BC required the rock face to be cut back such that it is likely that the epitheatron beyond the peripatos would have reached that point by then.

A coin of the Hadrianic period crudely suggests a division of the theatre into two sections, but only one diazoma, or horizontal aisle, and not two if the epitheatron went past the peripatos. The auditorium was divided by twelve narrow stairways into thirteen wedge-shaped blocks, kerkides, two additional staircases ran inside the two southern supporting walls. There is a slight slope to each step, the front edge is almost 10 cm lower than the back. The seats were 33 cm in depth and 33 cm in height with a forward projecting lip, with seventy-eight rows in total. The two fronts rows, still partially preserved today, consist of Pentelic stone chairs or thrones; these were the prohedria or seats of honour. Originally sixty-seven in number, the surviving ones each bear the name of the priest or official who occupied it, the inscriptions are all later than the fourth century, albeit with signs of erasure, and from the Hellenistic or Roman periods. The central throne, which is tentatively dated to the first century BC, belonged to the priest of Dionysus. Towards the orchestra there is a barrier from the Roman era, then a drainage channel contemporary with the Lycurgan theatre.

The skene of this phase was built back-to-back with the earlier long hall or stoa, the breccia foundations of which remain. It is evident that the new skene building consisted of a long chamber from which projected at either end northward two rectangular paraskenia. Whether there was also a distinct proskenion in the Lycurgan theatre is a subject of controversy, despite literary testimonia from the period there is no firm agreement where or of what form this took. This era is that of the new comedy of Menander and late tragedy of which it is sometimes supposed that the chorus disappeared from productions. It is further hypothesised that the decline in the use of the orchestra would imply, or permit, a raised stage where all the action would take place.

Amongst the innovations of the Hellenistic period was the creation of a permanent stone proskenion and the addition of two flanking paraskenia in front. The date of this construction is not secure, it belongs to some point between the third and first centuries BC. The proskenion was fronted with fourteen columns. Immediately above was the logeion, a roof to the proskenion, which perhaps functioned as a high stage. On this second storey and set back from the logeion is conjectured to be the episkenion whose facade was punctured with several thyromata or apertures where the pinakes or painted scenery would have been displayed. The date of this change devolves onto the question of the date at which the action of the drama transferred from the orchestra to the raised stage, and by analogy with other Greek theatres of the period and the direction of influence between Athens and the other cities. Wilamowitz argues that Dithyrambic contest ended with the choregia in 315, however, Pickard-Cambridge notes that the last recorded victory was in 100 AD. Clearly, the chorus was in decline during this period, so would have been the use of the orchestra. The theatres of Epidaurus, Oropos and Sikyon all have ramps up the logeion, their dates range from late fourth century to c. 250 BC. It remains an open question whether the existence of a logeion on these theatres implies a change in dramatic form at Athens.

Another feature of the Hellenistic stage that might have been used in Athens was the periaktoi, described by Vitruvius and Pollux, these were revolving devices for rapidly changing scenery. Vitruvius places three doors on the scaenae frons with a periaktos are the extreme ends which could be deployed to indicate that the actor coming stage-left or -right was at a given location in the dramatic context.

With the conquest of Greece by Sulla and the partial destruction of Athens in 86 BC The Theatre of Dionysus entered into a long decline. King Ariobarzanes II of Cappadocia is attributed with the reconstruction of the Odeion and the presence of an honorary inscription to him found embedded in a late wall of the skene suggest he may have had a hand in the reconstruction of the theatre, There appears to have been a general refurbishment during the time of Nero whose name was erased from the entablature of an aedicule of the scaenae frons in antiquity. The skene foundation was underpinned with limestone blocks in this period, the orchestra was reduced in size and refloored in varicoloured marble with a rhombus pattern in the centre. A marble barrier was erected in 61 AD or later, enclosing the orchestra up to the parodoi. The object of this might have been to protect the audience during gladiatorial combats. The last phase of restoration was in the Hadrianic or Antonine era with the construction of the Bema of Phaidros, an addition to the Neronian high pulpitum stage.

After the late 5th century AD the theatre was abandoned: its orchestra became an enclosed courtyard for a Christian basilica (aithrion) which was built into the eastern parados, while its cavea served as a stone quarry. The basilica was subsequently destroyed and by the mid-eleventh century the Rizokastro wall crossed the bema and the parodos walls. Archaeological examination of the site began in earnest in the nineteenth century with the excavation of Rousopoulos in 1861. Subsequent major archaeological campaigns were Dörpfeld-Reisch, Broneer and Travlos.

Evidence points to the enormous popularity of theatre in ancient Greek society. From competition for scarce seating, the expanding number of festivals and performances to theatre lovers touring the Rural Dionysia. It is also clear from fragments of audience reaction that have come down to us that the public were active participants in the dramatic performance, and that there was reciprocal communication between performers and spectators. It is possible, for example, that laws were enacted in the late fifth century to curtail comic outspokenness such was the offence taken by some of the views expressed on the stage. One anecdote that illustrates the fraught nature of this highly partisan audience reaction is that recorded by Plutarch who writes that in 468 BC when Sophocles was competing against Aeschylus there was so much clamour Kimon had to march his generals into the theatre to replace the judges and secure Sophocles’ victory. While ancient drama undoubtedly excited passion in contemporary spectators, there remains the question of to what degree they valued or appreciated the work before them. Aristotle's Poetics remarks: “[h]ence there is no need to adhere at all costs to the traditional stories, around which tragedies are constructed. For to try to do this would be ridiculous, since even the well-known materials well-known only to a few, but nevertheless delights all.” This raises the question of how uniform the response to Greek drama was, and whether communicative comprehension and audience competence can be taken for granted.

While the plays of the time are addressed to the adult male citizen class of the city, it is apparent that metics, foreigners and slaves were also in attendance; the cost of tickets was underwritten by the Theoric Fund. Much more controversial is whether women were also present. All arguments on the subject are ex silentio since there is no direct evidence that women attended the Theatre of Dionysus. Jeffrey Henderson argues that since women participated in other rites and festivals they could certainly have attended the theatre. In contrast, Simon Goldhill maintains that the City Dionysia was a socio-political event similar to the courts or the assembly from which women were excluded. No definite answer to the problem has been put forward.

Due to the poor state of its preservation, the acoustics of the Theatre of Dionysus cannot be reconstructed. However, by analogy with other, similar Greek theatres, some idea of the sound quality of the ancient theatre can be gleaned. Ancient theatres are long renowned for their excellent acoustics, but it is only recently that scientific analysis of this has taken place. The ERATO project in 2003–2006, Gade and Angelakis in 2006, and Psarras et al. in 2013 used omnidirectional source-receivers to make measured maps of strength, reverberation and clarity. Hak et al 2016, used a large number of source-receivers to make an even more detailed mapping. Their findings were that the speech clarity was best in the Odeon of Herodes Atticus and that there is a greater degree of reverberation at Epidaurus due to reflection from the opposing seats.

• Theatre of ancient Greece
• List of ancient Greek playwrights
• List of ancient Greek theatres
• Ancient Greek comedy
• Greek tragedy