Oper may refer to:
;Technology
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Operator (disambiguation)
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IRC operator
An IRC operator (often abbreviated as IRCop or oper) is a user on an Internet Relay Chat network who has privileged access. IRC operators are charged with the task of enforcing the network's rules, and in many cases, improving the network in vari ...
*
Outstanding Physical Education Preparation
"Outstanding" is a song originally performed by the Gap Band and written by member Raymond Calhoun. The song originally appeared on the group's platinum-selling 1982 album ''Gap Band IV''. It is one of their signature songs and biggest hits, rea ...
, a website for PE preparation
;Opera
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Deutsche Oper Berlin,
Oper Leipzig,
Komische Oper Berlin,
Alte Oper
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Romantische Oper
''Romantische Oper'' () was a genre of early nineteenth-century German opera, developed not from the German Singspiel of the eighteenth-century but from the opéras comiques of the French Revolution. It offered opportunities for an increasingly i ...
, genre of German opera
;Surname
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Andres Oper, Estonian football player
;Mathematics
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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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