Eday or variants may refer to:

Eday, one of the islands of Orkney, Scotland eDay, an electronic waste initiative in New Zealand E-Day, a military designation of days and hours El Día E ('E-Day'), Spanish Language Day Flugplatz Strausberg, Germany, ICAO airport EDAY Niño Martin Eday (born 1993), Filipino mountain biker Gears of War: E-Day, upcoming video game by Xbox Game Studios.

See also