The Apollo Belvedere or Apollo of the Belvedere — also called the Pythian Apollo — is a celebrated marble sculpture from Classical Antiquity. It was rediscovered in the late 15th century, during the Renaissance. From the mid-18th century, it was considered the greatest ancient sculpture by ardent neoclassicists and for centuries epitomized ideals of aesthetic perfection for Europeans and westernized parts of the world.

The white marble sculpture, which is 2.24 m (7.3 feet) high, depicts the Greek god Apollo, who has just overtaken the serpent Python, the cthonic serpent of Delphi. The arrow has just left his bow and the effort impressed on his musculature still lingers. His hair, lightly curled, flows in ringlets down his neck and rises gracefully to the summit of his head, which is encircled with the strophium, a band symbolic of gods and kings. His quiver is suspended across his left shoulder. He is entirely nude except that his robe (chlamys) is clasped at his right shoulder and is turned up only on his left arm and thrown back.

The lower part of the right arm and the left hand were missing when discovered and were restored by Giovanni Angelo Montorsoli (1506-63), a sculptor and pupil of Michelangelo.