LDD may refer to:
Government and politics Libertarian, Direct, Democratic, a Belgian party Lidhja Demokratike e Dardanisë (English: Democratic League of Dardania), a Kosovan party Local development document, in UK planning law
Science and technology ldd (Unix), a command-line utility Lego Digital Designer, CAD software Lhermitte–Duclos disease, a rare brain tumour Local Dialing Disparity Lymantria dispar dispar, a moth species Lightly Doped Drain, in a Metal–Oxide–Semiconductor Field-Effect Transistor
Other uses Learning difficulties and disabilities (UK) Living Dead Dolls Long Distance Dedication, a feature on the weekly syndicated radio program American Top 40 Lycée Denis Diderot (Kenya), a French international school