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.
Oedogonium is a genus of filamentous, free-living green algae, first discovered in the freshwaters of Poland 1860 by W.
The Oerlikon 20 mm cannon is a series of autocannons, based on an original German 20 mm Becker design that appeared very early in World War I.
Oecusse, also variously Oecussi, Ocussi, Oekussi, Oekusi, Okusi, Oé-Cusse, and formerly Ambeno and Oecussi-Ambeno, is both a municipality (Portuguese: Município Oecusse, Tetum: Munisípiu Oekusi) and a Special Administrative Region (SAR) (Portuguese: Região Administrativa Especial de Oecusse, RAEO; Tetum: Zona Espesial Ekonomiko Sosial no Merkadu Oekusi, ZEESM), and was formerly a district, of East Timor.