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.

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