LDK may refer to:
- The IATA airport code for Lidköping-Hovby Airport
- Democratic League of Kosovo (Lidhja Demokratike e Kosovës), a political party in Kosovo
- Grand Duchy of Lithuania (Lietuvos Didžioji Kunigaikštystė), a medieval state in Eastern Europe
- Legendary Dark Knight Sparda, a character in the Devil May Cry video games series
- LDK Solar Co, a Chinese company that manufactures crystalline solar wafers
- LDK Consultants, a Greece-based group of consulting companies
- LDK-TV, A YouTube based reality/vlogging Show
- Lycée de Kigali
- abbreviation for Living room, Dining room, Kitchen for housing options in Japan.
- L DK, a romantic comedy manga series by Ayu Watanabe.
- L.D.K. Lounge Designers Killer, a 2005 album by Japanese band Capsule.