Fetal Alcohol Syndrome, permanent and often devastating birth-defect syndromes caused by maternal overconsumption of alcohol during pregnancy

Federation of American Scientists, a non-profit organization formed in 1945 by scientists from the Manhattan Project

Financial Accounting Standard, a standard determined by the Financial Accounting Standards Board

Fatty acid synthase

Fes, Morocco, the third largest city in Morocco, as an alternate spelling

Foreign Agricultural Service, the part of the United States Department of Agriculture that has primary responsibility for overseas programs

Club Deportivo FAS, an Salvadoran football club

Football Association of Singapore

Foras Áiseanna Saothair, a state agency in the Republic of Ireland, with responsibility for assisting those seeking employment.

Free African Society, an 18th-century African-American community.

Ferrous Ammonium Sulfate (Mohr's Salt), a light green crystalline solid with the formula Fe(SO₄)₂(NH₄)₂.6H₂O (CAS number: 10045-89-3)

Free Alongside Ship, an Incoterm

Federation of Astronomical Societies, an international union of astronomical societies formed in 1974

Fas receptor, an important cell surface receptor protein of the TNF receptor family known also as CD95, that induces apoptosis on binding Fas ligand.