PSD may refer to:

Government and military

  • Payment Services Directive, EU regulation for payment services
  • Pesticides Safety Directorate, UK
  • Prabowo Subianto Djojohadikusumo, president of Indonesia
  • 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) ()

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