Oper may refer to:
- Technology
- Operator (disambiguation)
- Outstanding Physical Education Preparation, a website for PE preparation
- Opera
- Deutsche Oper Berlin, Oper Leipzig, Komische Oper Berlin, Alte Oper
- Romantische Oper, genre of German opera
- Surname
- Andres Oper, Estonian football player
- Mathematics
- Oper (mathematics) (as defined by Alexander Beilinson and Vladimir Drinfeld), a mathematical bundle on a punctured disc, equipped with a flat connection and an additional extra structure, called the "oper structure"
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