Ndia

Ndia or NDIA may refer to:
 * Ndia Constituency, Kirinyaga District, Central Province, Kenya
 * Alternative name for the Southern Kirinyaga dialect of the Kikuyu language
 * National Defense Industrial Association, an American trade association
 * National Digital Inclusion Alliance, an American non-profit organization
 * Hamad International Airport, an airport in Qatar, formerly known as New Doha International Airport
 * N.D.Ia., an abbreviation used for the United States District Court for the Northern District of Iowa