SSSR

SSSR may refer to:
 * Soyuz Sovetskikh Sotsialisticheskikh Respublik, the Latin alphabet transliteration of Союз Советских Социалистических Республик (СССР), the name of the Soviet Union in its official language, Russian
 * Society for the Scientific Study of Reading, a learned society promoting the study of reading and literacy
 * Society for the Scientific Study of Religion, a learned society for a social scientific perspective on religious institutions and experiences
 * Smallest Set of Smallest Rings, a cheminformatics term for the minimal cycle basis of a molecular graph