Oe or OE may refer to:
The Organisation for Economic Co-operation and Development (OECD; French: Organisation de coopération et de développement économiques, OCDE) is an intergovernmental economic organisation with 36 member countries, founded in 1961 to stimulate economic progress and world trade.
The Oedipus complex is a concept of psychoanalytic theory. Sigmund Freud introduced the concept in his Interpretation of Dreams (1899).
Oedipus (UK: , US: ; Greek: Οἰδίπους Oidípous meaning "swollen foot") was a mythical Greek king of Thebes.
Oenothera is a genus of about 145 species of herbaceous flowering plants native to the Americas. It is the type genus of the family Onagraceae.
Oenothera biennis (common evening-primrose, evening star, sun drop, weedy evening primrose, German rampion, hog weed, King's cure-all, or fever-plant.) is a species of Oenothera native to eastern and central North America, from Newfoundland west to Alberta, southeast to Florida, and southwest to Texas, and widely naturalized elsewhere in temperate and subtropical regions.
Oeiras (Portuguese pronunciation: [oˈɐjɾɐʃ]) is a municipality in western part of the Lisbon Metropolitan Area, subregion of Greater Lisbon, in continental Portugal.