LDN is usually contractional slang for London, UK.

LDN may also refer to:

Arts and media

• London Daily News, former newspaper
• BBC London (formerly BBC LDN), broadcasting body
• "LDN" (song), a 2006 single by Lily Allen

Language

• Láadan, a feminist, sci-fi conlang (by ISO 639-3 code)

Medicine

• Licensed Dietitian Nutritionist, a qualified dietician
• Low-dose naltrexone, off-label use for treatment of immune diseases

Science and technology

• Low dose naltrexone
• Day-night average sound level, Ldn or DNL
• Linked Data Notifications, a communications protocol
• Lynds' Catalogue of Dark Nebulae, not to be confused with LBN (Lynds' Catalogue of Bright Nebulae)

Transport

• Llandanwg railway station, Gwynedd, Wales (by National Rail station code)

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