Aquarius is the eleventh astrological sign in the Zodiac, originating from the constellation Aquarius. In western astrology, the sign is no longer aligned with the constellation as a result of the precession on the equinoxes. In astrology, Aquarius is considered a "masculine", positive (extrovert) sign. It is also considered an air sign and is one of four fixed signs. Aquarius has been traditionally ruled by the planet Saturn, and, since its discovery, Uranus has been considered a modern ruler of this sign. Being the eleventh sign of the zodiac, Aquarius is associated with the astrological 11th house.

Individuals born when the Sun was in this sign are considered Aquarius individuals. Under the tropical zodiac, the Sun is in Aquarius roughly from January 20 to February 18. Under the sidereal zodiac, it is currently there roughly from February 13 to March 14.