Oe
Oe or OE may refer to:

Education 
Old Edwardian (OE), a former pupil of various schools named after a King Edward or St. Edward
Old Etonian (OE), a former pupil of Eton College, England
Olathe East High School, a high school in Olathe, Kansas, US

Language and writing
Old English, the English language spoken in the Early Middle Ages
Œ or œ, a ligature of o and e used in the modern French and medieval Latin alphabets
Oe (digraph)
Open-mid front rounded vowel or 
Ö, a character sometimes representing 'oe', appearing in some Germanic, Turkic, and Uralic languages
Ø, a Northern European (Danish, Faroese, Norwegian) or Sami vowel, representing œ, 'oe' diphthong etc.
Ө, a letter in the Cyrillic alphabet
Kenzaburō Ōe, a major Japanese writer

Places
Oe, Estonia, a village of Estonia
Ōe, Yamagata, a town of Japan
Oe District, Tokushima, a former district of Japan
Ōe, Kyoto, a former town of Japan
Oe (Attica), a town of ancient Attica, Greece
Oe, a shortcut for the Czech city Otrokovice

Science and technology
°Oe, a measurement on the Oechsle scale for the density of grape must
Oersted (Oe), a unit of magnetic field strength
On30 or Oe, a model railway gauge
OpenEmbedded (OE), a Linux-based embedded build system
Opportunistic encryption (OE), a means to combat passive wiretapping
Outlook Express, a former email program of Microsoft
Ophryocystis elektroscirrha, a parasite of monarch and queen butterflies

Other uses
Ōe (surname), a Japanese surname
  (OE), a Portuguese order of engineers
Order of Excellence of Guyana, the highest honour of Guyana
Overseas experience (OE), a New Zealand term for extended working holidays
Okean Elzy, a Ukrainian rock band
OE, the aircraft registration prefix for Austrian aircraft
0e (disambiguation), listing uses with the number nought
Odakyū Enoshima Line