Other
- Sainik School Rewa - a senior secondary school in India
- Security sector reform
- Social Security (United States) Retirement
- The South Saskatchewan Regiment
- Southern Shorthaul Railroad
- Southern Suburbs Railway Project in Perth, Western Australia
- Soviet Socialist Republic - see Republics of the Soviet Union
- Slovak Soviet Republic (1919)
- Slovak Socialist Republic (1969–1990)
- Special Service Request (SSR) Codes - supplementary element of PNR
- Special Support and Reconnaissance, a Danish military special reconnaissance company
- Structure of Scientific Revolutions, a book by Thomas Kuhn
- Survival Stress Reaction
- Sustained silent reading, also called Standardized Sustained Reading
- Self Supporting Run-flat tires, see run flat tires
- SSR - a classification of US Navy submarines, see radar picket
- Software Specification Review
- Svenska Scoutrådet (SSR)
- Small Ships Register, another name for Part III of the UK Ship Register. SSR registration is simple and cheap, and provides proof of UK nationality but not individual ownership. It is applicable to pleasure craft only, is not mandatory in UK waters, but is strongly recommended for vessels that may travel to other countries.
Read more about this topic: SSR