- , a Digital Device which can include 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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