Nid may refer to:
- The Nidelva or Nid River in Trondheim, Norway
- Nīþ, a social stigma implying the loss of honour in historical Germanic society
acronym NID
- National Institute of Design, a design school in Ahmedabad, India
- National Institute of Design, Gandhinagar, a design school in Gandhinagar, India
- National Intelligence Director, the US official responsible for oversight of intelligence agencies
- Namespace Identifier, part of a Uniform Resource Name
- Naval Intelligence Division, of the British Admiralty, prior to 1965
- Network Identification Number, used in some mobile telephone networks
- Network interface device, in telecommunications, providing demarcation between carrier and customer wiring
- Network intrusion detection system, which tries to detect malicious activity by monitoring network traffic
- NID (Stargate), a fictional secret government organization in the television series Stargate SG-1
- Neuronal intestinal dysplasia, a condition involving abnormalities with the nerves supplying the bowel
- Nevada Irrigation District, in the Sierra Nevada foothills of California, organized to supply irrigation water
- Nights into Dreams..., a video game for the Sega Saturn
- Not Intentionally Doped, a semiconductor manufacturing technique