LDN

LDN may refer to:

Arts and media

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

Language

• Láadan, a feminist, sci-fi conlang (ISO 639-3:ldn)

Medicine

• Low-dose naltrexone, to treat immune diseases
• Licensed dietitian nutritionist, a qualified dietician

Places

• London, in British contractional slang
• Llandanwg railway station, north Wales (GBR:LDN)

Science and technology

• Day-night average sound level (Ldn)
• Linked Data Notifications, a communications protocol
• Lynds' Catalogue of Dark Nebulae, in astronomy