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 37 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.
The Oerlikon GDF or Oerlikon 35 mm twin cannon is a towed anti-aircraft gun made by Oerlikon Contraves (renamed as Rheinmetall Air Defence AG following the merger with Rheinmetall in 2009).
Oeiras (Portuguese pronunciation: [oˈɐjɾɐʃ]) is a municipality in western part of the Lisbon Metropolitan Area, subregion of Greater Lisbon, in continental Portugal.