SDSS may refer to:
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Sloan Digital Sky Survey, a major multi-filter imaging and spectroscopic redshift survey
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Social Democratic Party of Slovakia
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Spatial Decision Support System, a GIS based decision aiding system
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Independent Democratic Serb Party, a political party of Croatian Serbs (''Samostalna demokratska srpska stranka'' in Serbo-Croatian)
*
South Delta Secondary School, a school in Delta, British Columbia, Canada
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