SDE

SDE can stand for:

In science, medicine, and technology

 * Screen door effect, a video display issue
 * Sebacoyl dinalbuphine ester, an analgesic
 * Semantic dictionary encoding
 * Software development engineer
 * Software development environment
 * Spatial Database Engine (ArcSDE)
 * Spectral density estimation
 * Stochastic differential equation
 * sub-divisional error, a read head error mechanism
 * System development environment

In politics

 * Social Democratic Party (Estonia)
 * State delegate equivalents, a part of the

In transportation

 * The IATA code for Vicecomodoro Ángel de la Paz Aragonés Airport, an airport in Argentina
 * Senai–Desaru Expressway, an expressway in Johor, Malaysia
 * Shadwell railway station, a railway station in London, England

Other uses

 * S.D.E., a 2000 album by Cam'ron
 * Self Defined Ethnicity, an ethnic classification code used by the British government and police
 * Self-directed education, self-learning, often synonymous with unschooling
 * Strong-side defensive end, a position in American football