Other
- Old English, a term for the form of the English language spoken in the Early Middle Ages.
- On30 or Oe, a model railway gauge
- Old Edwardian (OE), a former pupil of various schools named after a King Edward or St. Edward
- Olathe East High School, a high school in Olathe, Kansas
- Opportunistic encryption (OE), a means to combat passive wiretapping
- O.E., Order of Excellence of Guyana, highest honour of Guyana
- Overseas experience (OE), a New Zealand term for extended working holidays
- OpenEmbedded (OE), a Linux-based embedded build system
- OE, the prefix given to the Aircraft registration number of Austrian aircraft (from the German language name of the country, Republik Österreich, where the Ö is rendered as an Oe phoneme).
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