SSD (disambiguation)
- Ministry of State Security (North Korea)
- SSD
- SSD (band)
- Sardar Sarovar Dam
- Saturated-surface-dry
- Scalextric Sport Digital
- Schizophrenia spectrum disorders
- Schwartz sequential dropping
- Sexual size dimorphism
- Signal-sensing domain
- Silver sulfadiazine
- Singapore School for the Deaf
- Single-sided deafness
- Siroi language
- Sisters School District
- Social Security Disability Insurance
- Solid-state drive
- Somatic symptom disorder
- South Sudan
- Special School District of St. Louis County
- Speech sound disorder
- Stansted Airport railway station
- Sterol-sensing domain
- System sequence diagram
- United States–Russia Strategic Stability Dialogue