Eridanus can refer to:

Rivers

* Eridanos (mythology) (or Eridanus), a river in Greek mythology, somewhere in Central Europe, which was territory that Ancient Greeks knew only vaguely *The

Po River The Po ( , ; la, Padus or ; Ligurian language (ancient), Ancient Ligurian: or ) is the longest river in Italy. It flows eastward across northern Italy starting from the Cottian Alps. The river's length is either or , if the Maira (river), Mair ...

, according to Roman word usage * Eridanos (Athens), a former river near Athens, now subterranean *

Eridanos (geology) The name Eridanos, derived from the ancient Greek Eridanos, was given by geologists to a river that flowed where the Baltic Sea is now. Its river system was better known as the "Baltic River System". The Eridanos began about 40 million years a ...

, a former large river that flowed between forty million and seven hundred thousand years ago from Lapland to the North Sea through where the Baltic Sea is now

Astronomy

* Eridanus (constellation), a southern constellation * Eridanus Cluster of galaxies in the constellation Eridanus * Eridanus II, a low-surface brightness dwarf galaxy in the constellation Eridanus * List of stars in Eridanus * Delta Eridani, a star * Eta Eridani, a star * Gamma Eridani, a star * Eridanus Supervoid, a large-scale cosmic underdensity

Miscellaneous

* Éridan (rocket), a French rocket * ''Éridan''-class minehunter, a class of French naval minehunters *'' Eridanosaurus'', a rhinocerotid originally described as a crocodilian * USS ''Eridanus'' (AK-92), a ship of the United States Navy * Eridan Ampora, a character from the webcomic '' Homestuck''. {{disambiguation, geo