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PDA may refer to:^[1]

Technology/Computing

• Personal digital assistant, an electronic device which can include some of the functionality of a computer, a cellphone, a music player, and a camera
• Phase-Doppler analyzer, a kind of instrument for measure particle velocity and size
• Pushdown automaton, a type of abstract device in automata theory

Mathematics

• Pitch detection algorithm, a mathematical method of finding the pitch of a signal
• Parameter Data Area, the layout of the parameters of subprograms in Software AG's programming language NATURAL
• Probabilistic Data Association, a method for association of (measured) data with system model objects (e.g. association of radar detections with system tracks)
• Pushdown automaton, a type of abstract device in automata theory

Politics

• Polo Democrático Alternativo, (Alternative Democratic Pole), a political party in Colombia
• Progressive Democratic Alliance, an historical political party in British Columbia, Canada
• Progressive Democrats of America, a political organization in the United States

Organizations

• Parenteral Drug Association (PDA), global provider of science, technology and regulatory information and education for the pharmaceutical and biopharmaceutical community.
• Peruvian Debate Asociation (PDA), Organization in charge of inter-school debating in Peru. Holds the Semestral PDA Debate Competition twice every year.

Travel

• Pakistan Domestic Airlines (PDA), the internal National flag carrier which is part of the wider branch of PIA

Other

• PDA (song), a song by the band Interpol
• Patent ductus arteriosus, a heart defect
• Pinoy Dream Academy, the Philippine franchise of Endemol's Star Academy
• Private defense agency
• Pub Design Awards
• Public display of affection
• PDA, an episode of Aqua Teen Hunger Force
• Polydiacetylenes (PDA), a family of conducting polymers
• Past Doctor Adventures, a series of spin-off novels based on the long running BBC science fiction television series Doctor Who
• Potato dextrose agar
• Personal Development Award - A qualification from the Scottish Qualifications Authority

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