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 (also spelled Œdipus complex) is a concept of psychoanalytic theory. Sigmund Freud introduced the concept in his Interpretation of Dreams (1899) and coined the expression in his A Special Type of Choice of Object made by Men (1910).
Oedipus (UK: , US: ; Greek: Οἰδίπους Oidípous meaning "swollen foot") was a mythical Greek king of Thebes.
Oeiras (Portuguese pronunciation: [oˈɐjɾɐʃ]) is a municipality in western part of the Lisbon Metropolitan Area, subregion of Greater Lisbon, in continental Portugal.
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).
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.