NDR

• Non delivery report, a return email message to a sender indicating failed message delivery
• Network Data Representation, an implementation of the OSI model presentation layer
• Network detection and response, detection of abnormal system behaviors on network traffic data

• Negative differential resistance
• Naming and Design Rules in metadata
• Neighborhood deformation retract, a kind of topological subspace
• National Data Repository, a system to store data about a nation's natural resources
• Nonlinear dispersion relation, in plasma physics

• IATA code for Nador International Airport, airport in Morocco
• Postal code for Nadur, Gozo, Malta
• National Driver Register, United States
• Non-invasive disc rehabilitation, NDR Method
• Norddeutscher Rundfunk, a public radio and television broadcaster in northern Germany
• Norwich Northern Distributor Road or Broadland Northway, a major route around the north of Norwich, England
• North Diversion Road, which is a nickname to North Luzon Expressway and formerly its official name
• Our Home – Russia ({{Langx|ru|Наш Дом Россия|Nash Dom Rossiya|links=no}}), defunct Russian political party
• Singapore National Day Rally, an annual address that the Prime Minister of Singapore makes to the nation

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