OP

• 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 ==Businesses and organizations==

• Operational planning, the process of planning short term measures in a company • OP Financial Group, a Finnish company • Oborový podnik ("specialized business"), a bygone Czechoslovak state designation for a business entity • Ocean Pacific, a retail clothing company • Oratory Preparatory School, in New Jersey, United States • Order of Preachers (, Dominican Order) a Catholic religious order • Odisha Police, police patrol in Odisha, India • Publications Office of the European Union (), interinstitutional body of the European Union • Open Philanthropy, research and grant making foundation ==Computing==

• Original post (or poster), the opening entry (or author thereof) in a thread or discussion in an internet forum • Overpowered (game balance), in video games, when a particular aspect or character is lacking game balance • Op, an abbreviated form of operator, or sysop, a user with administrative rights in multi-user computer systems • Over-provisioning, a phenomenon associated with solid state storage; see ==Mathematics==

• Op (statistics), a symbol used in probability mathematics • Octagonal prism ==Places==

• Orchard Park, New York • Overland Park, Kansas • O'Brien Peak • O'Cain Point • O'Connor Peak • O'Donnell Peak • O'Fallon Park • O'Higgins Park • O'Leary Peak • O'Neal Point • O'Neill Peak • O'Neill Point • O'Neill Regional Park • O'Shea Peak • O'Sullivan Peak ==Other uses==

• Observation post, a position from which soldiers can watch enemy movements • Old Pauline, the term for a former pupil of St Paul's School, London • Old Peterite, the term for a former pupil of St Peter's School, York • Orange Pekoe, a grade of black tea • Organophosphate, the general name for esters of phosphoric acid • Overall Position, the grade appointed to Queensland high-school graduates • O.P. Anderson, a Swedish spirit of the aquavit type • Opportunity point, a tennis term for an opportunity to potentially break serve when the score is 15–30 ==See also==