{{wiktionary|SAD}} The initialism '''SAD''' may refer to:
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==Disorders== * Schizoaffective disorder, a psychiatric diagnosis * Social anxiety disorder * Seasonal affective disorder, typically winter depression * Separation anxiety disorder
==Organizations== ===Political or military=== * Shiromani Akali Dal, a political party in India * Special Activities Division of the US Central Intelligence Agency, now named the Special Activities Center * Saraya Awliya al-Dam, an Iraqi militia
===Sports clubs=== * ''{{lang|es|Sociedad Anónima Deportiva}}'', a type of incorporated sports club in Spain * ''{{lang|pt|Sociedade Anónima Desportiva}}'', a type of incorporated sports club in Portugal
==Science and technology== * Selected area diffraction, a crystallographic experimental technique * Sum of absolute differences, in digital image processing * Single-wavelength anomalous dispersion, in X-ray crystallography
==Transportation== * Sandwell & Dudley railway station, with the station code SAD * Safford Regional Airport, Arizona, US, with the IATA airport code SAD
==Songs== * "S.A.D.", by Man Overboard from ''Heart Attack'' (2013) * "Sad!", by XXXTENTACION (2018)
==Other uses== * SAD scheme, a form of intellectual property enforcement in the United States * Singles Awareness Day, a humorous holiday every February 14 * The Single Administrative Document, EU customs form * The Standard American Diet, another name for the Western pattern diet * The Suicide Attack Database, now named the Database on Suicide Attacks * Sagittal abdominal diameter, body diameter at the waistline
==See also== * Sad (disambiguation)
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