Perseus (Pertseo) iparraldeko zeruko konstelazio bat da eta II. mendeko Ptolomeo astronomoak zerrendatutako 48 konstelazioetako bat. Nazioarteko Astronomia Elkarteak (IAU) definitutako 88 konstelazio modernoen artean dago. Perseus-en inguruan Greziar mitologian oinarritutako konstelazio ugari daude, Andromeda mendebaldean, Camelopardalis eta Cassiopeia iparraldean. Perseus-ek ere mugakide ditu Aries, Taurus baita Auriga eta Triangulum mendebaldean.

Perseus is a constellation in the northern sky and It is one of the 48 ancient constellations listed by the 2nd-century astronomer Ptolemy, and among the 88 modern constellations defined by the International Astronomical Union (IAU. It is located near several other constellations named after ancient Greek legends surrounding Perseus, including Andromeda to the west, Camelopardalis and Cassiopeia to the north. Perseus also is bordered by Aries, Taurus also Auriga and Triangulum to the west.