SR
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SR or sr may stand for:
- Special relativity
- Sarcoplasmic reticulum
- Saudi riyal, the currency of Saudi Arabia
- senior (Sr.), suffix on the name of a father when his son is given the same name (suffixed with Jr.).
- Serbian language (ISO 639 alpha-2)
- Socialist-Revolutionary Party
- Southern Railway (UK)
- Southern Railway (US) (although the railroad's AAR reporting mark, SOU, is more widely used)
- steradian (sr), a unit of solid angle
- strontium (Sr), chemical symbol for chemical element
- Suriname (ISO 3166-1 alpha-2 country code)
- Sveriges Radio, Sweden's national publicly-funded radio broadcaster
- Swissair
- The SR flip-flop, an electronic logic device (see boolean algebra)
- SR programming language
- Saarländischer Rundfunk, a regional public broadcaster in Germany
- Sørvágs Róðrarfelag, an association for faroese rowing in the village of Sørvágur