OP

OP or Op may refer to:

==Arts and entertainment== One Piece, a 1997 Japanese manga and anime OP, an abbreviated term for opening theme songs in anime Opposite prompt, a stage right prompt corner on a theatre stage Optimus Prime, a character from the Transformers franchise Op., short for opus number, used to denote one work of musical composition from many Original pronunciation, the phonology of Early Modern English, as used in William Shakespeare's time, specifically when used to perform his works in modern times. Out of print, a status of a book title at a publishing house