SPD (disambiguation)

SPD is a common acronym, it may stand for:
*Sacramento Police Department
*Saidpur Airport, IATA code for an airport in Bangladesh
*Saint Patrick's Day, an international Irish and Catholic holiday
*Seattle Police Department
*Serial Presence Detect, a way to store information about the RAM chips on a DIMM module
*Shimano Pedaling Dynamics - A service mark that now defines a common type of "clipless" bicycle pedal for mountain bicycles. Shimano also sells road bicycle pedals under the mark SPD-SL, which are not compatible with the widely-known mountain bike SPD
*Sigma Phi Delta, an international social-professional engineering fraternity
*Small Press Distribution, a non-profit literary arts organization in Berkeley, California
*Social Democratic Party of Germany
*South Pacific Division of Seventh-day Adventists
*Space Patrol Delta, the fictional organization destined to protect the universe in "", the 13th Power Rangers incarnation
*Special Police Dekaranger, the fictional police organization in Tokusou Sentai Dekaranger
*Spectral Power Distribution, a general concept applied to a signal in mathematics and physics
*Suspended Particle Device, a technology for varying the light transmission properties of glass and plastics electrically
*Symmetric positive-definite, a property of matrices in mathematics.
*An abbreviation for speed

Computing

*Serial Presence Detect, in computing, an EEPROM chip on a memory module that contains speed and design information about the module
*Surge Protective Device, a device for surge suppression
* Security Policy Database, a component of an IPsec-stack

Psychology and medicine related

*Sadistic personality disorder - a personality disorder characterized by cruel and aggressive behaviour
*Semantic pragmatic disorder, a pervasive developmental disorder
*Sensory Processing Disorder - see Sensory Integration Dysfunction
*Schizoid personality disorder is a personality disorder characterized by a lack of interest in social relationships, a tendency towards a solitary lifestyle, and emotional coldness
*Schizotypal personality disorder, schizotypal disorder - personality disorder that is characterized by a need for social isolation, odd behaviour and thinking, and often unconventional beliefs such as being convinced of having extra sensory abilities
*Sleep paralysis disorder, a condition characterized by temporary paralysis of the body shortly after waking up or before falling asleep
*Sociopathic personality disorder - another name for Antisocial personality disorder
*Spondyloperipheral dysplasia - a genetic disorder affecting bone
*Symphysis pubis dysfunction - pelvic joint pain experienced during pregnancy or childbirth