DCN may refer to:

• Daily Commercial News, an Australian shipping newspaper first published in 1891
• Decorin, a member of the proteoglycan family proteins
• Deputy Chief of Navy, Australia
• Direction des Constructions Navales, French shipbuilder
• Dorsal cochlear nucleus, a structure located on the brainstem
• Dynamic circuit network, a high performance computer network technology

• Belgravia, Edmonton
• Belgravia Edmonton
• Bel Group
• Belgthor
• Belguim
• Belgum
• Belgutei
• Belgweiler
• Belgütei
• Belhadj
• Belhar Confession
• Belhare language
• Belhariya
• Belharra
• Belhar Secondary School
• Belhaven
• Belhaven Brewery
• Belhaven Hill School
• Belhaven (NC)
• Belhaven, Scotland
• Belhelvie
• Belhorod
• Belhurst Castle
• Belhus
• Belhus, Essex