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