SGA may refer to:

• Old Irish language (ISO 639-3 code)
• Schwarz-Gelbe Allianz (Black-Yellow Alliance), an Austrian political party
• Second-generation antipsychotics
• Séminaire de Géométrie Algébrique du Bois Marie, an influential mathematical seminar and the series of books it produced.
• SGA Airlines (Siam General Aviation), a regional airline in Thailand
• SG&A, Selling, General and Administrative expenses in income statements
• Simple Genetic Algorithm
• Small for gestational age, babies whose birth weight lies below the 10th percentile for that gestational age
• Society of Graphic Art, a British arts organization founded in 1919
• Songwriters Guild of America, an organization to help "advance, promote, and benefit" the profession of songwriters
• Southern Governors' Association
• 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
• Student Government Association, a student organization dedicated to social and organizational activities of the student body
• 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
• Segesterone acetate, a progestin medication
• Shai Gilgeous-Alexander, Canadian professional basketball player

• Supraglottic Airway, an airway management device