SRJ could mean:
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Stockholm–Roslagens Järnvägar
Stockholm–Roslagens Järnvägar (SRJ) was a private railway company in Sweden 1885–1951, running a vast network of narrow gauge railways in Roslagen north of Stockholm. The company was taken over by Swedish State Railways in 1951, formally comb ...
, a defunct private railway company in Sweden
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Serbia and Montenegro
Serbia and Montenegro ( sr, Cрбија и Црна Гора, translit=Srbija i Crna Gora) was a country in Southeast Europe located in the Balkans that existed from 1992 to 2006, following the breakup of the Socialist Federal Republic of Yu ...
, known as Federal Republic of Yugoslavia from 1992 to 2003 ( sr-Latn, Savezna Republika Jugoslavija, link=no)
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Spherical Rolling Joint, a high precision ball joint consisting of a spherical outer and inner race separated by ball bearings
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