.ss is the designated country code top-level domain (ccTLD) for South Sudan in the Domain Name System of the Internet. It is derived from the ISO 3166-1 alpha-2 code for South Sudan, which is SS. According to CIO East Africa, the TLD was allocated on 10 August 2011 following the country's declaration of independence from Sudan. The TLD was registered on 31 August 2011; , it is not in the DNS root zone and thus not operational.

SS, S.S., Ss, Ss., or ss may refer to:

• Schutzstaffel, a paramilitary organisation in Nazi Germany banned as criminal in 1945
• Secret service, a government agency, or the activities of a government agency, concerned with the gathering of intelligence data

The Schutzstaffel (SS; also stylized as with Armanen runes; ; literally "Protection Squadron") was a major paramilitary organization under Adolf Hitler and the National Socialist German Workers' Party (NSDAP; Nazi Party). It began with a small guard unit known as the Saal-Schutz ("Hall-Protection") made up of NSDAP volunteers to provide security for Nazi Party meetings in Munich. In 1925, Heinrich Himmler joined the unit, which had by then been reformed and given its final name. Under Himmler's direction (1929–45), it grew from a small paramilitary formation to one of the most powerful organizations in the Third Reich. From 1929 until Nazi Germany's collapse in 1945, the SS was the foremost agency of surveillance and terror within Germany itself and the occupied territories in Europe.