PDA

PDA may refer to:

Science and technology

 * Parts departing aircraft, mid-air loss of screws, rivets, doors, etc.
 * Patron-driven acquisition, a mechanism for libraries to purchase books
 * Personal digital assistant, a mobile device
 * Photodiode array, a type of detector
 * Pitch detection algorithm, to find the pitch of a signal
 * Polydiacetylenes, a family of conducting polymers
 * Predictive analytics, a form of business analytics
 * Pushdown automaton, in automata theory

Biology and medicine

 * Pancreatic ductal adenocarcinoma, the main type of pancreatic cancer
 * Pathological demand avoidance, in psychology
 * Patent ductus arteriosus, a heart defect
 * Posterior descending artery, an artery
 * Potato dextrose agar, a microbiological media for culturing yeast and fungus

Music

 * "PDA" (Interpol song), a song by Interpol
 * "PDA", a song by the Backstreet Boys from This Is Us
 * "PDA", a song by Audio Adrenaline from Audio Adrenaline
 * "P.D.A. (We Just Don't Care)", a song by John Legend

Organizations

 * Parenteral Drug Association, a global pharmaceutical trade association
 * Pharmacists' Defence Association, UK
 * Peruvian Debate Association, for inter-school debating
 * Pinoy Dream Academy, the Philippine franchise of Endemol's Star Academy
 * Population and Community Development Association, Thailand
 * Private defense agency, an enterprise which would provide personal protection and military defense services to individuals
 * Professional Driver Association, of NASCAR drivers before the 1969 Talladega 500
 * Public development authority, government-owned corporations in Washington, US

Politics

 * Alternative Democratic Pole, a political party in Colombia (Polo Democrático Alternativo)
 * Progressive Democratic Alliance, a former political party in British Columbia, Canada
 * Progressive Democrats of America, a progressive political organization
 * Party of Democratic Action, a Bosniak party in Bosnia-Herzegovina
 * Movement of Democratic Action, a political party in Bosnia-Herzegovina (Pokret demokratske akcije)
 * Aruban Democratic Party, an Aruban political party (Partido Democrático Arubano)

Law and culture

 * Public display of affection, an act of physical intimacy in the view of others
 * Pregnancy Discrimination Act, US
 * "PDA" (The Office), an episode from the American television sitcom The Office
 * Past Doctor Adventures, spin-off novels from the BBC's Doctor Who
 * Pub Design Awards, UK
 * Professional Development Award, offered by the Scottish Qualification Authority
 * Pathological Demand Avoidance