'''SR1''', '''SR-1''', '''SR.1''' or '''Sr1''' may refer to: __NOTOC__ ==Science and mathematics== * SR1 RNA, a small RNA produced by bacteria * SR1, a candidate phylum of bacteria more commonly known as ''Absconditabacteria'' * Symmetric rank-one, a mathematical algorithm
==Products and technology== * HDR-SR1, a Sony camcorder * Peugeot SR1, a hybrid concept car * Radical SR1, a sports car * Vintage Ultralight SR-1 Hornet, an American homebuilt aircraft * VR Class Sr1, a class of Finnish electric locomotives * VSR SR-1 Snoshoo, an American Formula One racing aircraft design * Six Chuter SR1, an American powered parachute design * SR1, a FIA Sportscar Championship classification * SR1, a 4-stroke Yamaha motorcycle * SR.1, a semi-rigid airship built in 1918 for the British navy * SR-1 Freedom, a nuclear-powered spacecraft proposed by NASA * SR-1 Vektor, a Russian pistol
==Media== * ''Saints Row'' (2006 video game) * ''Slime Rancher'' (2017 video game) * SR1 Europawelle, a music station operated by Saarländischer Rundfunk (Saarland Broadcasting)
==Other== * Spelling Reform 1, an Australian English-language spelling reform proposal * State Route or State Road 1; see List of highways numbered 1
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