• Director of National Intelligence, a U.S. cabinet-level official
• Director of Naval Intelligence
• Direct neural interface, an interface between a brain and a computer
• Do not intubate, a medical directive
• National Department of Investigations, a Honduran government agency
• Documento Nacional de Identidad, the name of the national identity document in several Spanish-speaking countries.
• Dole Nutrition Institute founded by the Dole Food Company
• Diabetes Network International, a UK charity

See also

• D'ni, a culture in Myst
• DNIS, a telephone service feature