SAD

• 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 • '''', a type of incorporated sports club in Spain • '''', 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==