SR

'SR', in each context, may stand for:
;Geography

★ Saudi riyal, the currency of Saudi Arabia.

★ Slovak Republic

★ Socialist Republic, as in "SR Serbia", "SR Croatia", etc.

★ Suriname (ISO 3166-1 alpha-2 country code)
;Organisations

★ Socialist-Revolutionary, as in Socialist-Revolutionary Party.

★ Sørvágs Róðrarfelag, a Faroese rowing association.

★ Saarländischer Rundfunk, a German regional public broadcasting company.

★ Sveriges Radio, Sweden's national publicly-funded radio broadcasting company.
;Science

★ 'sr' stands for steradian, the SI unit of solid angle.

★ ''Sedimentation rate'', shorter form of the medical term Erythrocyte Sedimentation rate

★ Sarcoplasmic reticulum, a structure found within muscle cells

★ Shift register, a group of processor registers set up in a linear fashion

★ Single-reduction, a type of steam turbine

★ Sinus rhythm, the pattern made by a healthy heart on an electrocardiogram

★ Special relativity, a theory of space and time created by physicist Albert Einstein

★ Strontium, a chemical element of atomic number 38

★ Strouhal number, a number used to describe oscillating flow mechanisms

★ SR ''flip-flop'' circuit, an electronic logic device

★ SR programming language, a concurrent computer programming language

★ Sustained release formulation of a medicine, e.g. Wellbutrin SR

★ Systematic review standardized review
;Transport

★ Silk Road, a historically-significant interconnected series of caravan and ocean vessel trading routes across south-east Asia

★ Southern Railway (UK)

★ Southern Railway (US)

★ State Road, a road designation system in the U.S. state system

★ Swissair (IATA code)
;Culture

★ ''School Rumble'', an anime and manga series.

★ ''Shadowrun'', a cyberpunk fantasy roleplaying game.

★ ''Simply Red'', a pop/rock band

★ ''Skarloey Railway'', a fictional railway in both ''The Railway Series'' and ''Thomas the Tank Engine and Friends'' by W.V. Awdry

★ ''Sonic Riders'' or ''Sonic R'', both racing video games from the Sonic the Hedgehog series

★ ''Sonic Rush'', a video game

★ ''Steve Rothery'', the guitarist of Marillion

★ ''Superman Returns'', a 2006 film based on the iconic superhero
;Other

★ Spelling reform, demonstrably different from simplified spelling (particularly in the case of Hebrew).

★ scoville rating, a measure of the "hotness" of a chili pepper

★ Seaman Recruit, the lowest enlisted rank in the U.S. Navy and Coast Guard
=Sr.=
'Sr.' may stand for:

★ Senior, added after a father's name when his son (suffixed "Jr.") has the same name.

★ Sister, a nun's formal title.
= sr =
'sr' may stand for:

★ Serbian language (ISO 639 alpha-2)

★ Steradian, a unit of solid angle.