Eridanus

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, according to Roman word usage
 * Eridanos (Athens), a former river near Athens, now subterranean
 * Eridanos (geology), 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
 * 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 (2009-2016)