ARDE

ARDE can refer to:


 * Democratic Revolutionary Alliance, (Alianza Revolucionaria Democrática), a Contra group of the Southern Front guerrillas in Nicaragua that fought against the Marxist elements of the original Sandinista revolution in 1979
 * Armament Research and Development Establishment, An Indian national defense laboratory under DRDO, located in Pune
 * UK Armament Research and Development Establishment, created in 1955 and renamed Royal Armament Research and Development Establishment (RARDE) in 1962
 * The Aspect Ratio Dependent Etching effect found in Deep reactive-ion etching.