Pisces is the twelfth astrological sign in the Zodiac, which originates from the Pisces constellation. In western astrology this sign is no longer aligned with the constellation because of the precession of the equinoxes. Pisces is represented by a pair of fish that are swimming in opposite directions, but remain held together at the tail by a cord. In astrology, Pisces is considered a feminine sign or negative sign. It is also a water sign, and is one of four mutable signs. Being the twelfth sign, Pisces is associated with the astrological 12th house. Pisces has been traditionally ruled by the planet Jupiter, but since its discovery, Neptune has been considered a modern ruler of this sign. Some astrologers mostly use one to the exception of the other, but some consider them to be co-rulers of this sign and essentially use both (see Domicile).

Individuals born when the Sun was in this sign are considered Pisces individuals. Under the tropical zodiac, the Sun is in Pisces roughly from February 19 to March 20, and under the sidereal zodiac, it is currently there roughly from March 15 to April 13.