PSD

Last updated January 29, 2026

PSD may refer to:

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
Armoured Division (Finland) (Finnish: Panssaridivisioona)

Language

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

Places

Philippine School for the Deaf, a school in Pasay, Philippines
Port Said Airport, Egypt (IATA: PSD)
Poudre School District, Colorado, United States

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, 1987 –2003), 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
Private Sector Development, term used in international development
PSD Bank, German banking group
FK PSD, a handgun

This disambiguation page lists articles associated with the title PSD.
If an internal link led you here, you may wish to change the link to point directly to the intended article.

This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.

PSD

Contents