| SS | Submarine or submersible ship | Navy |
| SS | Sand Storm (METAR Code) | Acronym |
| SS | Schutzstaffel (German, roughly "Protection Squadron"; Nazi elite Praetorian guard) | Acronym |
| SS | U.S. Secret Service | Acronym |
| SS | Spanish Ship | Acronym |
| SS | Stainless steel | Acronym |
| SS | Stockholm Skins | Acronym |
| SS | Submarine (US Navy hull classification) | Acronym |
| SS | Super Sport | Acronym |
| SS | Surface-to-Surface (missile) | Acronym |
| SS | Subsea, as in a datum of depth, e.g. TVDSS (True Vertical Depth Subsea) | oil&gas |
| SS | (celestial object) Symbiotic Star, a type of binary star system containing a red giant and a hot dwarf star that generate a cone-shaped nebula | astronomy |
| SS | sunset | aerospace |
| SS | Second Series | Chemistry abbreviations |
| SS | Solid Solution | Chemistry abbreviations |
| SS | Stop Staircase | Community abbreviations |
| SS | Summerset Spectacular | Community abbreviations |
| SS | Social Studies | Educational abbreviations |
| SS | Standard Score | Educational abbreviations |
| SS | Safety System | Electronics abbreviations |
| SS | Small Signal | Electronics abbreviations |
| SS | Steady State | Electronics abbreviations |
| SS | Substation | Electronics abbreviations |
| SS | Super Slim | Electronics abbreviations |
| SS | Script Source | computing abbreviations and acronyms |
| SS | Single Sided | computing abbreviations and acronyms |
| SS | Stack Segment | computing abbreviations and acronyms |
| SS | Super Saiyan | computing abbreviations and acronyms |
| SS | Super Support | computing abbreviations and acronyms |
| SS | Super- System | computing abbreviations and acronyms |
| SS | Systematic Search | computing abbreviations and acronyms |
| SS | Screen Shot | media abbreviations and acronyms |
| SS | Seconds Sponsored | media abbreviations and acronyms |
| SS | Separate Screen | media abbreviations and acronyms |
| SS | Sesame Street | media abbreviations and acronyms |
| SS | Simple Syndication | media abbreviations and acronyms |
| SS | Spongebob Squarepants | media abbreviations and acronyms |
| SS | The Star Syndicate | media abbreviations and acronyms |
| SS | (Number) Sea State (Number) | Military abbreviations |
| SS | Sakura Station | Military abbreviations |
| SS | Scout Sniper | Military abbreviations |
| SS | Selective Service | Military abbreviations |
| SS | Side Story | Military abbreviations |
| SS | Sideshot | Military abbreviations |
| SS | Silent Service | Military abbreviations |
| SS | Silent Strike | Military abbreviations |
| SS | Silver Star | Military abbreviations |
| SS | Single Source | Military abbreviations |
| SS | Sinking Ship | Military abbreviations |
| SS | Slave Select | Military abbreviations |
| SS | Smoke Screen | Military abbreviations |
| SS | Sniper Syndicate | Military abbreviations |
| SS | Southern Soliders | Military abbreviations |
| SS | Special Services | Military abbreviations |
| SS | Special Shot | Military abbreviations |
| SS | Special Staff | Military abbreviations |
| SS | Specific Suggestion | Military abbreviations |
| SS | Submarine | Military abbreviations |
| SS | Subordinate System | Military abbreviations |
| SS | Super Sector | Military abbreviations |
| SS | Surface-to-Surface | Military abbreviations |
| SS | Sustainable Site | Military abbreviations |
| SS | System Specification | Military abbreviations |
| SS | System Supervisor | Military abbreviations |
| SS | System Support | Military abbreviations |
| SS | Systems Summary | Military abbreviations |
| SS | Susquehanna Section | Non-Profit Organizations |
| SS | Source Safe | software abbreviations and acronyms |
| SS | Style Sheet | software abbreviations and acronyms |
| SS | Shortstop | sports abbreviations |
| SS | Skid Snap | sports abbreviations |
| SS | Societa Sportiva | sports abbreviations |
| SS | Soft Standing | sports abbreviations |
| SS | Special Sport | sports abbreviations |
| SS | Split Squad | sports abbreviations |
| SS | Sport Sheath | sports abbreviations |
| SS | Super Sports | sports abbreviations |
| SS | Super Sportsman | sports abbreviations |
| SS | Sweet Spot | sports abbreviations |
| SS | Summer Semester | University abbreviations |
| SS | Superultramodern Science | University abbreviations |
