PDE

PDE may refer to:

Mathematics

 * Partial differential equation, differential equation involving partial derivatives (of a function of multiple variables)

Life sciences

 * Phosphodiesterase, enzyme important in intracellular communication
 * Pug dog encephalitis

Organizations

 * The European Democratic Party (esp. in Spanish, French or Italian languages)

Technology and engineering

 * Program development environment
 * Pulse detonation engine, proposed substitute to the traditional jet engine

Philosophy

 * Principle of double effect

Places

 * Punta del Este

Other modes of abbreviation

 * Polydichloric euthimal, fictional substance
 * Pde (or Pde.), "Parade" (when serving as part of the proper name of a street or other way)
 * Present Day English