Oe or OE may refer to:
Oedipus (US: or or UK: ; Ancient 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.
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.
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.