LDD

LDD may refer to:


 * Learning difficulties and disabilities (UK)
 * Lego Digital Designer, a CAD software application for designing Lego models
 * Lhermitte–Duclos disease, a rare, slowly growing tumor of the cerebellum
 * Libertarian, Direct, Democratic, a Belgian political party
 * Lidhja Demokratike e Dardanisë (English: Democratic League of Dardania), a political party in Kosovo
 * Local development document, a set of documents specified in United Kingdom planning law
 * Local Dialing Disparity
 * Lycée Denis Diderot (Kenya), a French international school in Nairobi, Kenya
 * Lightly Doped Drain, a sub-structure in a MOSFET that is intended to permit operation with higher drain-source voltage
 * Long Distance Dedication, a feature on the weekly syndicated radio program American Top 40
 * ldd (Unix), a utility to List Dynamic Dependencies
 * Living Dead Dolls
 * Lymantria dispar dispar, a species of moth (gypsy moth)