SAD
- Database on Suicide Attacks
- Heart Attack (Man Overboard album)
- SAD scheme
- Sad (disambiguation)
- Sad!
- Safford Regional Airport
- Sagittal abdominal diameter
- Saraya Awliya al-Dam
- Schizoaffective disorder
- Seasonal affective disorder
- Selected area diffraction
- Separation anxiety disorder
- Shiromani Akali Dal
- Single Administrative Document
- Single-wavelength anomalous dispersion
- Singles Awareness Day
- Social anxiety disorder
- Sociedad Anónima Deportiva
- Sociedade Anónima Desportiva
- Special Activities Center
- Sum of absolute differences
- Western pattern diet