DN, dN, or dn may refer to:
Science, technology, and mathematics Computing and telecommunications Digital number, the discrete of an analog value sampled by an analog-to-digital converter Directory number in a phone system Distinguished Name, an identifier type in the LDAP protocol Domain name, an identification string used within the Internet Domain Nameserver DOS Navigator, a DOS file manager
Mathematics dn (elliptic function), one of Jacobi's elliptic functions Dn, a Coxeter–Dynkin diagram Dn, a dihedral group Dn, a Dirichlet kernel
Other uses in science and technology Decinewton (symbol dN), an SI unit of force Diametre Nominal, the European equivalent of Nominal Pipe Size Diameter of a rolling element bearing in mm multiplied by its speed in rpm Deductive-nomological model, a philosophical model for scientific explanation Double negative T cells, also called CD4−CD8− Diabetic nephropathy Diabetic neuropathy DN Factor, a value used to calculate the correct lubricant for bearings
Entertainment Double nil, a bid in the game of Spades (card game) Descriptive chess notation Duke Nukem, a video game character and a game franchise
Journalism The Ball State Daily News, the student newspaper of Ball State University in Muncie, Indiana , a Norwegian newspaper , a Swedish newspaper Democracy Now!, the flagship program for the Pacifica Radio network Diário de Notícias, a Portuguese newspaper
Places Denmark (WMO country code DN) DN postcode area for Doncaster and surrounding areas, UK Dunedin, New Zealand (commonly abbreviated DN) Dadra and Nagar Haveli, a former union territory of India
Other uses DN, IATA code of Dan Air Down (disambiguation) Diebold Nixdorf, American financial technology company Digha Nikaya, a part of the Buddhist Tripitaka International DN, a kind of iceboat Dreadnought, a class of warships Debit note, a commercial document DN, then IATA code for Norwegian Air Argentina DN, then IATA code for Senegal Airlines Central Sulawesi (vehicle registration prefix DN)