Eridian can refer to:
an adjective, related to Eris, a dwarf planet in the Solar System; an adjective, related to Constellation Eridanus (abbrev: Eri) an alien species from the novel Project Hail Mary by Andy Weir, from 40 Eridani (40 Eri) star system in the Eridanus constellation an ancient, extinct alien species from the Borderlands series, from the fictional planet Eridanus
See also
Eris (disambiguation) Eridan (disambiguation) Eridani
Eridania (disambiguation) Eridanus (disambiguation), including "Eridani" Erid (disambiguation) ERI (disambiguation)