Capricorn is the tenth astrological sign in the Zodiac, originating from the constellation of Capricornus. In western astrology, this sign is no longer aligned with the constellation as a result of the precession of the equinoxes. In astrology, Capricorn is considered a "feminine", negative (introvert) sign. It is also considered an earth sign and one of the four cardinal signs. Capricorn is ruled by the planet Saturn. Being the tenth sign of the zodiac, Capricorn has been associated with the astrological tenth house.

Individuals born when the Sun was in this sign are considered Capricorn individuals. Under the tropical zodiac, the Sun enters Capricorn by definition at the moment of winter solstice, or roughly at December 22, and leaves it around January 19. Under the sidereal zodiac, it is currently there roughly from January 15 to February 15. The Sanskrit name of Capricorn in Hindu astrology is Makara.

Capricorn is sometimes depicted as a sea-goat, and sometimes as a terrestrial goat. The reasons for this are unknown, but the image of a sea-goat goes back at least to Babylonian times.

"The symbol of the goat rising from the body of a fish represents with greatest propriety the mountainous buildings of Babylon rising out of its low and marshy situation; the two horns of the goat being emblematic of the two towns, Nineveh and Babylon, the former built on the Tigris, the latter on the Euphrates; but both subjected to one sovereignity."