Pisces is a constellation of the zodiac. Its vast bulk — and main asterism viewed in most European cultures per Greco-Roman antiquity as a distant pair of fishes connected by one cord each that join at an apex — are in the Northern celestial hemisphere. Its traditional astrological symbol is (♓︎). Its name is Latin for "fishes". It is between Aquarius, of similar size, to the southwest and Aries, which is smaller, to the east. The ecliptic and the celestial equator intersect within this constellation, at the first point of Aries, and in Virgo, at the first point of Libra. The Sun passes directly overhead of the equator, on average, at approximately this point in the sky, at the March equinox.

The right ascension/declination 00 is located within the boundaries of Pisces.

The March equinox is currently situated in Pisces, directly south of ω Psc, and because of precession, it is gradually drifting westward, just below the western fish and moving toward Aquarius.

Although Pisces is a large constellation, there are only two stars brighter than magnitude 4 in Pisces. It is also the second dimmest of the zodiac constellations.

Due to the dimness of these stars, the constellation is essentially invisible in or near any major city due to light pollution.

M74 is a loosely wound (type Sc) spiral galaxy in Pisces, found at a distance of 30 million light years (redshift 0.0022). It has many clusters of young stars and the associated nebulae, showing extensive regions of star formation. It was discovered by Pierre Méchain, a French astronomer, in 1780. A type II-P supernova was discovered in the outer regions of M74 by Robert Evans in June 2003; the star that underwent the supernova was later identified as a red supergiant with a mass of 8 solar masses. It is the brightest member of the M74 Group.

NGC 488 is an isolated face-on prototypical spiral galaxy. Two supernovae have been observed in the galaxy.

NGC 520 is a pair of colliding galaxies located 105 million light-years away.