PDA may stand for:

• Personal digital assistant, an electronic device which can include some of the functionality of a computer, a cellphone, a music player and a camera
• Pitch detection algorithm, a mathematical method of finding the pitch of a signal
• Public display of affection, an area of study within social psychology
• Patent ductus arteriosus, a congenital heart defect
• Pushdown automaton, a type of abstract device in automata theory
• Progressive Democratic Alliance, an historical political party in British Columbia, Canada
• Progressive Democrats of America, a political organization in the United States
• Past Doctor Adventures, a series of spin-off novels based on Doctor Who
• phase-Doppler analyzer, a kind of instrument for measure particle volecity and size
• Polydiacetylenes
• Polo Democratico Alternativo, (Alternative Democatic Pole), a political party in Colombia
• Philbin Da Avenger
• Private defense agency
• PDA is a song by the band Interpol
• Posterior descending artery, one of the coronary arteries
• Panic Disorder with Agoraphobia
• Perception-Decision-Action, a model of cognition

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