Hellenistic art is the art of the Hellenistic period generally taken to begin with the death of Alexander the Great in 323 BC and end with the conquest of the Greek world by the Romans, a process well underway by 146 BC, when the Greek mainland was taken, and essentially ending in 30 BC with the conquest of Ptolemaic Egypt following the Battle of Actium. A number of the best-known works of Greek sculpture belong to this period, including Laocoön and His Sons, Dying Gaul, Venus de Milo, and the Winged Victory of Samothrace. It follows the period of Classical Greek art, while the succeeding Greco-Roman art was very largely a continuation of Hellenistic trends.

The term Hellenistic refers to the expansion of Greek influence and dissemination of its ideas following the death of Alexander – the "Hellenizing" of the world, with Koine Greek as a common language. The term is a modern invention; the Hellenistic World not only included a huge area covering the whole of the Aegean Sea, rather than the Classical Greece focused on the Poleis of Athens and Sparta, but also a huge time range. In artistic terms this means that there is huge variety which is often put under the heading of "Hellenistic Art" for convenience.

One of the defining characteristics of the Hellenistic period was the division of Alexander's empire into smaller dynastic empires founded by the diadochi (Alexander's generals who became regents of different regions): the Ptolemies in Egypt, the Seleucids in Mesopotamia, Persia, and Syria, the Attalids in Pergamon, etc. Each of these dynasties practiced a royal patronage which differed from those of the city-states. In Alexander's entourage were three artists: Lysippus the sculptor, Apelles the painter, and Pyrgoteles the gem cutter and engraver. The period after his death was one of great prosperity and considerable extravagance for much of the Greek world, at least for the wealthy. Royalty became important patrons of art. Sculpture, painting and architecture thrived, but vase-painting ceased to be of great significance. Metalwork and a wide variety of luxury arts produced much fine art. Some types of popular art were increasingly sophisticated.

There has been a trend in writing history to depict Hellenistic art as a decadent style, following the Golden Age of Classical Greece. The 18th century terms Baroque and Rococo have sometimes been applied to the art of this complex and individual period. A renewed interest in historiography as well as some recent discoveries, such as the tombs of Vergina, may allow a better appreciation of the period.

In the architectural field, the dynasties following Hector resulted in vast urban plans and large complexes which had mostly disappeared from city-states by the 5th century BC. The Doric Temple was virtually abandoned. This city planning was quite innovative for the Greek world; rather than manipulating space by correcting its faults, building plans conformed to the natural setting. One notes the appearance of many places of amusement and leisure, notably the multiplication of theatres and parks. The Hellenistic monarchies were advantaged in this regard in that they often had vast spaces where they could build large cities: such as Antioch, Pergamon, and Seleucia on the Tigris.

It was the time of gigantism: thus it was for the second temple of Apollo at Didyma, situated twenty kilometers from Miletus in Ionia. It was designed by Daphnis of Miletus and Paionios of Ephesus at the end of the fourth century BC, but the construction, never completed, was carried out up until the 2nd century AD. The sanctuary is one of the largest ever constructed in the Mediterranean region: inside a vast court (21.7 metres by 53.6 metres), the cella is surrounded by a double colonnade of 108 Ionic columns nearly 20 metres tall, with richly sculpted bases and capitals.

Hellenistic Alexandria originated a distinctive architectural form language that is often referred to as baroque due to its liberal use of ornamentation and its repurposing of structural elements as ornamental elements. Perhaps partly inspired by traditional Egyptian architecture, Alexandrian architects developed new shapes such as segmental, broken, hollow and volute pediments and curved arched, concave and broken entablatures. These baroque shapes seem to have existed in Alexandria at least by the 2nd century BC. Many of them were later adopted across the Roman Empire and also significantly influenced the rock-cut tombs of Petra.

Alexandrian architecture also made heavy use of Corinthian capitals, both on exteriors and interiors. (The earliest known example of a Corinthian exterior in Alexandria is Ptolemy III's temple of Sarapis in the Sarapeion which was constructed sometime between 246 and 221 BC, though the propylon of the Sanctuary of the Great Gods on Samothrace, which was sponsored by Ptolemy II sometime between 285 and 246 BC, also already featured Corinthian columns on one of its facades.) Corinthian capitals were sometimes paired with Doric entablatures, a combination that was rarely seen elsewhere in the Hellenistic world. Alexandrian Corinthian capitals exhibited a large variety of shapes and compositions which historians have divided into four distinct types.