CDL
- 450 (disambiguation)
- 450 (number)
- AD 450
- CCAir
- CD1
- CDI (disambiguation)
- California Digital Library
- Call of Duty League
- Canadian Defence Lawyers
- Canal Defence Light
- Carbondale station
- Chancellor of the Duchy of Lancaster
- Character Description Language
- Chief of Defence Logistics
- Child-directed language
- China Democratic League
- Chodiala railway station
- Christian Defense League
- Chung Dahm Learning
- Citadel Broadcasting Corporation
- Citizens for Decency through Law
- City Developments Limited
- College du Leman
- Color Decision List
- Commercial driver's license
- Common Data Link
- Compiler Description Language
- Container-deposit legislation
- Controlled digital lending
- DIGITAL Command Language
- House of Freedoms
- Liberal Democratic Centre
- List of airports in Alaska
- List of aviation, aerospace and aeronautical abbreviations
- Roman numerals