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 œ
- Ö, a character sometimes representing 'oe', appearing in some Germanic, Turkic, and Uralic languages
- Ø, a Northern European (Norwegian, Danish) 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
- Ordem dos Engenheiros (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