A quadriga is a car or chariot drawn by four horses abreast and favoured for chariot racing in Classical Antiquity and the Roman Empire until the Late Middle Ages. The word derives from the Latin quadrigae, a contraction of quadriiugae, from quadri-: four, and iugum: yoke. In Latin the word quadrigae is almost always used in the plural and usually refers to the team of four horses rather than the chariot they pull. In Greek, a four-horse chariot was known as τέθριππον téthrippon.

The four-horse abreast arrangement in a quadriga is distinct from the more common four-in-hand array of two horses in the front and two horses in the back.

Quadrigae were raced in the Ancient Olympic Games and other contests. They are represented in profile pulling the chariot of gods and heroes on Greek vases and in bas-relief. During the festival of the Halieia, the ancient Rhodians would sacrifice a quadriga-chariot by throwing it into the sea. The quadriga was adopted in ancient Roman chariot racing.

Quadrigas were emblems of triumph; Victory or Fame often are depicted as the triumphant woman driving it. In classical mythology, the quadriga is the chariot of the gods; the god of the Sun Helios (often identified with Apollo, the god of light) was depicted driving his quadriga across the heavens, delivering daylight and dispersing the night.