PAA

PAA may refer to:

Businesses and organizations

 * Pacific American Airlines
 * Pamoja African Alliance, a Kenyan political party
 * PanAfrican Archaeological Association
 * Pan African Association
 * Pan American World Airways, commonly known as Pan Am
 * Pan American Association of Anatomy
 * Patriot Alliance Association, a radical Chinese nationalist party in Taiwan
 * Pittsburgh Athletic Association, athletic and social club
 * Polish American Association
 * Population Association of America, dedicated to population and demography studies
 * Portland Adventist Academy, an Adventist High School

Chemistry and materials science

 * Peroxyacetic acid, a chemical
 * Pharmacologic Ascorbic Acid, a medical treatment
 * Phenylacetic acid, a chemical
 * Phosphoamino acid analysis, a biochemistry technique
 * Polyacrylamide, an acrylate polymer
 * Polyacrylic acid, an acrylic polymer
 * Primary Aromatic Amine, a group of compounds

Electronic devices

 * Personal Attack Alarm
 * Piezo Audio Amplifier

Linguistics

 * Proto-Afroasiatic language
 * Proto-Austroasiatic language

Statistics

 * Piecewise Aggregate Approximation, dimension reduction method

Legislation

 * Perpetuities and Accumulations Act 1964, UK act of Parliament
 * Perpetuities and Accumulations Act 2009, UK act of Parliament
 * Protect America Act of 2007, amendment to the US Foreign Intelligence Surveillance Act

Other uses

 * Penny Arcade Adventures, video game series
 * Prueba de Aptitud Académica, standardized test for university admissions