Oper

Oper may refer to:


 * Technology
 * Operator (disambiguation)
 * IRC operator
 * 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"