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
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
- Dominican Order (Latin: Ordo Praedicatorum), a Catholic religious order
- Odisha Police, police patrol in Odisha, India
- Publications Office of the European Union (French: Office des publications de l'Union européenne), interinstitutional body of the European Union
Internet
- 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
Mathematics and computers
- Op (statistics), a symbol used in probability mathematics
- Octagonal prism
- Over-provisioning, a phenomenon associated with solid state storage; see Write amplification § Over-provisioning
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, an ex-pupil of St Paul's School, London
- Old Peterite, 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
- Op-amp, short for operational amplifier
- Op-ed, a newspaper opinion piece
- Operation (disambiguation)
- Operator (disambiguation)
- OPS (disambiguation)
- Ops (disambiguation)
- Op. cit., opere citato, or "in the work cited"
- 0P (disambiguation) (zero p)
- All pages with titles beginning with OP
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