NDI

NDI may refer to:

Organisations

 * National Dance Institute, a not for profit organization
 * National Democratic Institute for International Affairs
 * Northern Digital Incorporated, a provider of 3D tracking systems
 * National Datacast Incorporated, the PBS datacasting subsidiary

Science and technology

 * Nephrogenic diabetes insipidus, a form of diabetes insipidus due primarily to pathology of the kidney
 * Network Device Interface, an IP Video and Audio Protocol developed by NewTek
 * Naphthalene diimides, dyes used in chemistry; See Naphthalene tetracarboxylic dianhydride
 * New Dietary Ingredient, defined by the Dietary Supplement Health and Education Act of 1994 to be a dietary ingredient not marketed in the United States before October 15, 1994

Other uses

 * Non-Destructive Inspection, in nondestructive testing
 * Non-developmental item, in the Federal Acquisition Regulation
 * Net disposable income