SSA or ssa may refer to:
Geography Sub-Saharan Africa
Organizations Sainsbury's Staff Association Schonfeld Strategic Advisors, an American hedge fund Scottish Socialist Alliance, a coalition of left-wing bodies, fore-runner to the Scottish Socialist Party Seismological Society of America, an international scientific society founded 1906 Shan State Army, a former insurgent group in Burma Shipconstructors' and Shipwrights' Association, a former British trade union Singapore Scout Association, a youth movement founded in 1910 Slovak Society of Actuaries (), a professional association in Slovakia Soaring Society of America, an American sporting society founded in 1932 Society for the Study of Addiction, a British society with charitable status Society of Scottish Artists, an artists society founded in 1891 SSA Global Technologies, an American software company acquired by Infor Global Solutions Steamship Authority, a Massachusetts ferry service and regulatory body Sudan Studies Association, an American professional association Swedish Society of Radio Amateurs, an amateur radio organization
Education School of Saint Anthony, Quezon City, Philippines Secular Student Alliance, United States Shady Side Academy, Pittsburgh, Pennsylvania, United States
Government Saudi Space Agency, a Saudi government agency Senior Special Assistant, a Nigeria government role Social Security Administration, an independent agency of the U.S. federal government Social Security Agency (Northern Ireland) Selective Service Act of 1917, an American piece of legislation signed by President Woodrow Wilson during WWI that established nationwide conscription State Security Agency (South Africa), a South African intelligence service
Computing Stochastic Simulation Algorithm Serial Storage Architecture Singular Spectrum Analysis Software Security Assurance Solid State Array, in flash data storage using solid-state drives Start of Selected Area, a control character in the C1 control code set Static single-assignment form, a property of intermediate representations used in compilers Stationary Subspace Analysis Strong subadditivity of quantum entropy SubStation Alpha and .ssa file format, a video subtitle editor Super systolic array
Science Semantic structure analysis Single-strand annealing in homologous recombination Side-side-angle in geometry for solving triangles Specific surface area, a property of solids
Medicine Anti-SSA/Ro autoantibodies Senile systemic amyloidosis Sessile serrated adenoma, a type of pre-malignant intestinal polyp Special somatic afferent Sulfosalicylic acid
Other uses ESA Space Situational Awareness Programme Same-sex attraction Sarva Shiksha Abhiyan, the Government of India's Education for All programme Self-sampling assumption Serious Sam Advance, a 2004 video game Shared services agreement Slippery slope argument, a rhetorical device (and often a fallacy) Special Service Agreement, between the UN and a contractor Special services area or business improvement district SSA, Grand Cross of the Order of the Star of South Africa Supervisory Special Agent Salvador Bahia Airport, an IATA code Nilo-Saharan languages, ISO 639-2 and ISO 639-5 codes