# PSD

PSD may refer to:

## Educational bodies

* Pennsylvania School for the Deaf, a Pre-K to 12th grade school for Deaf and Hard of Hearing students, located in the Germantown section of Philadelphia, Pennsylvania
* Philippine School Doha, a Filipino school in Doha, Qatar
* Pontiac School District, a school district in Michigan, US
* Poudre School District, a school district in Larimer County, Colorado

## Government and military

* Payment Services Directive, EU regulation for payment services
* Pesticides Safety Directorate, UK
* Presidential Study Directive, a kind of national security directive from the Obama presidency
* Prevention of Significant Deterioration (PSD) permit, under the Clean Air Act (United States)
* Protective Services Detail, Personal Security Detachment, or Personal Security Detail; US military security details

## Language

* Pennsylvania Sumerian Dictionary, lexicography project for the ancient language isolate
* Plains Indian Sign Language (ISO 639-3 code: psd)
* Proto-South Dravidian, unattested language of south India

## Political parties
### Africa

* Social Democratic Party (Angola), a political party of Angola
* Social Democratic Party (Benin), a political party of Benin
* Social Democratic Party of Madagascar, a political party of Madagascar
* Social Democratic Party (Rwanda), a political party of Rwanda
* Socialist Destourian Party, former name (to 1988) of the ruling party in Tunisia, currently called Constitutional Democratic Rally

### Americas

* Parti social démocratique du Québec, a former provincial political party in Canada
* Democratic Socialist Party (Argentina), a defunct political party of Argentina
* Social Democratic Party (Brazil, 1945–65), a defunct political party of Brazil
* Social Democratic Party (Brazil, 2011), a current political party of Brazil
* Social Democratic Party (El Salvador), a political party of El Salvador
* Social Democratic Party (Mexico), a defunct political party of Mexico
* Social Democratic Party (Nicaragua), a political party of Nicaragua

### Europe

* Civil Movement "People's Self-Defense", a defunct political movement in Ukraine which was part of the Our Ukraine–People's Self-Defense Bloc electoral alliance
* Party of Socialists and Democrats, a major political party of San Marino
* Social Democratic Party of Albania, a minor political party of Albania
* Social Democratic Party (France), a defunct political party of France
* Social Democratic Party (Moldova), a political party of Moldova
* Social Democratic Party (Portugal), a major political party of Portugal
* Social Democratic Party (Romania), a major political party of Romania
* Social Democratic Party (Spain), a defunct political party of Spain

## Science and engineering
### Computing

* Personal or portable storage device
* .psd, a Photoshop document file extension
* Professional Scrum Developer, a course leading to certification for Scrum (development)
* Power spectral density, the distribution of power per unit time into frequency components composing that signal.

### Medicine

* Protein S deficiency
* Post-stroke depression
* Postsynaptic density, a specialization of the cytoskeleton at the synaptic junction
* Psychiatric service dog

### Other uses in science and engineering

* Particle size distribution, in granular materials
* Platform screen doors, in railway platforms
* Position sensitive device or detector, a two-dimensional photodetector
* Positive semidefinite (disambiguation)
* Power spectral density, distribution of power of a signal
* Program Service Data, data displayed on HD radio receiver

## Other uses

* PSD (rapper), a Californian rapper and hip-hop producer
* Port Said Airport, Egypt (IATA code PSD)
* Private Sector Development, term used in international development
* PSD Bank, German banking group
* Patricia Street Deli, a famous sandwich and soup restaurant located in the tourist town of Jasper, Alberta, Canada
* FK PSD, a handgun chambered mainly in 7.5 FK but also comes with barrels for 10mm Auto and 9x19mm