NM, nm, and variations may refer to:
The N-methyl-D-aspartate receptor (also known as the NMDA receptor or NMDAR), is a glutamate receptor and ion channel protein found in nerve cells.
New Musical Express (NME) is a British music journalism magazine published since 1952. It was the first British paper to include a singles chart, in the edition of 14 November 1952. In the 1970s it became the best-selling British music newspaper.
Nmap (Network Mapper) is a security scanner, originally written by Gordon Lyon (also known by his pseudonym Fyodor Vaskovich), used to discover hosts and services on a computer network, thus building a "map" of the network.
NmVac4-A/C/Y/W-135 is the commercial name of the Meningococcal meningitis polysaccharide serogroups A,C,Y and W-135 vaccine of JN-International Medical Corporation.
NME's Cool List is an annual listing of popular musicians compiled by the weekly British music magazine NME.
NMEA 2000, abbreviated to NMEA2k or N2K and standardised as IEC 61162-3, is a plug-and-play communications standard used for connecting marine sensors and display units within ships and boats.