SP is a two-letter acronym that may refer to:
In computing and technology
* Scalable POWERparallel, IBM's SP and SP2
* service pack
* Service Provider
* short perforation (philately)
* Short Play, a vinyl record (or single) format
* Short Play (VCR format)
* signal processor
* Single-player Term for a single-player video game, or variation of the same.
* stack pointer (computers)
* Stored procedure - a program stored in a database
In economics
* SaskPower (Canada)
* SATA Air Acores, IATA airline designator
* SP Technical Research Institute of Sweden
* Share price
* Southern Pacific Railroad (AAR reporting marks SP)
* starting price bookmaking (known colloquially as SP)
* Starting prices (UK) a betting term
In geography
* São Paulo (city)
* São Paulo (state)
* Severna Park, Maryland
* South Park
* South Pole
In healthcare
* simulated patient
* Sleep Paralysis
* Social phobia, an anxiety disorder.
* standardized patient
* "Status Post" in medical charting to indicate recent completion of a treatment
In mathematics
* Sp(n) and Sp(2n,F), in mathematics, denote a symplectic group or its corresponding Lie algebra
* Spur (mathematics)
In military
* Self-propelled artillery
* Shore Patrol (U.S. Navy)
* Soft point bullet, a type of ammo
In music, entertainment and popular culture
* Game Boy Advance SP
* Sahil Prasada rapper
* Sans Pression (Québec Hip Hop group, one member is also known as SP)
* Sex Pistols, a UK punk band
* Skinny Puppy, a Canadian industrial band
* Simon Phillips, an English drummer
* Simple Plan, a Canadian pop-punk band
* The Smashing Pumpkins (An American alternative rock band)
* Snow Patrol (A Scottish alternative rock band)
* Something Positive (A popular webcomic)
* Strawberry Panic!
* Sleepo Peeps (An Entertaining Super Group)
* Team SP (A branch of Sleepopeeps)
In politics
* Secular-progressive, abbreviated S-P, used to describe people who advocate government independence from religious influences
* Shining Path, a Maoist guerrilla insurgent organization in Peru.
* Socialist Party or Social Democratic Party
* Samajwadi Party (India)
* Samata Party (India)
* Saskatchewan Party
* Schleswigsche Partei
* Centre Party (Senterpartiet)
* Socialistische Partij, a current political party in The Netherlands
* Socialistische Partij, a historical name for the SP.A in Belgium
* Socialistische Partij, a historical political party in The Netherlands (1918-1929)
* Southern Party (United States)
Other uses
* Sapeur-pompier (French firefighter)
* Secondary power
* Security Phase in the United Nations
* Sidney Pacific, a graduate student dormitory at MIT.
* Singapore Polytechnic - A polytechnic in Singapore.
* Sotilaspoliisi, the military police of the Finnish Defence Forces. SP is written in white on a black cloth on the sleeve.
* Spelling
* SP Food Additive A food additive used in China
* state park (US)
* state police (US)
* Suomen Partiolaiset - the Finnish national Scout Association
* Südtiroler Pfadfinderschaft - a Scout Association in South Tyrol
* Superintendent of Police
* Suppressive Person - in the Church of Scientology, formally a condemned and shunned heretic or wrongdoer, loosely used to describe a source of trouble
* Surface-protrusion
* SP is a USCS symbol for poorly graded sand