FAB Fab and FAB may refer to:

• Força Aérea Brasileira, the Brazilian Air Force
• Fab (semiconductors) - a fabrication plant for semiconductor manufacture
• Fab (magazine) - a Canadian gay magazine
• a verb meaning to construct or make, particularly for metal fabrication.
• a slang word that is short for fabulous
• the nickname of drummer Fabrizio Moretti of The Strokes
• a book by Neil Gershenfeld
• FAB - an acronym for Flavoured Alcoholic Beverages, also known as alcopops
• F.A.B. - a radio sign-off used in the "Thunderbirds" TV series.
• Fab (fragment binding antigen) is an antibody fragment that includes the variable, antigen binding region.
• Fab (ice lolly) - a frozen confectionery
• A Laundry Detergent marketed by Colgate-Palmolive