PSD

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 (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

• Port Said Airport, Egypt (IATA code PSD)
• Poudre School District, Larimer County, Colorado, United States
• Private Sector Development, term used in international development
• PSD (rapper), a Californian rapper and hip-hop producer
• PSD Bank, German banking group
• FK PSD, a handgun chambered mainly in 7.5 FK but also comes with barrels for 10mm Auto and 9x19mm