Look up SAD in Wiktionary, the free dictionary.

The initialism SAD may refer to:

Medicine

• Schizoaffective disorder, a psychiatric diagnosis
• Social anxiety disorder
• Seasonal affective disorder, typically winter depression
• Separation anxiety disorder in children
• Sagittal abdominal diameter, body diameter at the waistline

Organisations

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.", from Man Overboard's 2013 album Heart Attack

Other uses

• Singles Awareness Day, a humorous holiday every February 14
• The Single Administrative Document, EU customs form
• The Suicide Attack Database, now named the Database on Suicide Attacks
• The Standard American Diet, another name for the Western pattern diet

See also

• Sad (disambiguation)