SGA may refer to:
- Old Irish language (ISO 639-3 code)
- Schwarz-Gelbe Allianz (Black-Yellow Alliance), an Austrian political party
- Scottish Games Association, a Highland games group
- Second Generation Antipsychotic
- Same Gender Attraction
- Séminaire de Géométrie Algébrique, an influential mathematical seminar and the series of books it produced.
- SGA Airlines (Siam General Aviation), a regional airline in Thailand
- SGA Business Systems (SGA Business Systems, Inc.), a Lotus Notes software developer and IBM Premier Partner
- Selling/General/Administrative, a standard expense line in Income Statements
- Simple Genetic Algorithm
- Small for gestational age, babies whose birth weight lies below the 10th percentile for that gestational age
- Société Générale d'Alimentation, an airline in Congo
- Solicitations for Grant Applications - a term used by the U.S. government for open grant applications
- Songwriters Guild of America, an organization to help "advance, promote, and benefit" the profession of songwriters
- Southern Governors' Association - (SGA) uses the power of connection, collaboration and communications in a bipartisan manner to solve regional problems, improve quality of life and secure an economically vibrant and prosperous American South
- Spectrum generating algebra in physics.
- Stadium Giveaway - refers to an item given free to those attending a sporting event, typically baseball
- Standard Galactic Alphabet, the writing system in the Commander Keen fictional universe
- Stargate Atlantis, an American-Canadian science fiction television series and a spin-off from the television series Stargate SG-1
- String Graph Assembler, genome sequence assembler software
- Student Government Association, a student organization dedicated to social and organizational activities of the student body
- Subjective Global Assessment, a nutritional status assessment method sometimes used in hospitals or clinics by healthcare professionals to assess patients' nutritional status
- Substantial Gainful Activity, a term defined by the U.S. Social Security Administration to describe work that involves physical or mental effort and is ordinarily done for pay
- Swanson Group Aviation, Formerly Superior Helicopter of Glendale, Oregon, a heavy lift helicopter operator
- Swedish Game Awards, Sweden's largest video game development competition
- Synthetic genetic array analysis - a high throughput methodology for studying genetic interactions
- System Global Area, a shared memory structure that is created by Oracle databases at instance startup
- Samsung Galaxy Ace, an Android smartphone manufactured by Samsung