Other
- Society of the Divine Savior, a Catholic order founded in 1881
- Samsung SDS, a subsidiary of the Samsung Group, formerly Samsung Data Systems
- Short Derived Solemnent, a hypnotic state where tranced students are called to visualize the future and look back towards the hypnosis as the start of something great.
- Scientific Data Systems, a 1960s computer manufacturer later bought by Xerox
- Self-Directed Search, a career interest test
- The ISO 639-3 language code for the Sened language
- Service Development Studio, a tool for creating IP Multimedia Subsystem (IMS) applications
- Seven deadly sins, a classification of objectionable vices
- Short Data Services, a service of Terrestrial Trunked Radio two-way radios similar to SMS text messages
- Shwachman–Diamond syndrome, a rare genetic disorder chiefly affecting the blood and pancreas
- Siberian Business Union, a Russian holding company
- Social and Decision Sciences, a department within Carnegie Mellon University
- Software Defined Silicon, computer chip technology created by XMOS of Bristol, UK
- Software Defined Storage a software architecture for software defined data centers.
- Spartanburg Day School, a private K-12 school in Spartanburg, South Carolina
- Special Delivery Service, the fictional employer of Postman Pat in the British animated television series
- Special Demonstration Squad, A branch of Greater London's Metropolitan Police Service
- Special Direct System, a drill bit fixing system
- Srpska Državna Straža or Serbian State Guard, forces that were used to complement the civil police in Serbia from 1942 to 1944
- Sun Java System Directory Server in IT, nicknamed Sun Directory Server, an LDAP server from Sun.
- Zung Self-Rating Depression Scale, a psychological self-rating scale for depression
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