NMI
NMI or nmi may refer to:

Organisations
 National Measurement Institute, the measurement standards body of the Australian Government 
National metrology institute, in metrology
 National Museum of Indonesia 
 National Museum of Ireland
 Nazarene Missions International, a ministry of the Church of the Nazarene
 Nelson Mandela Institution
 New Mexico Airlines (ICAO code)
 Nissan Motor Indonesia
 NMI Mobility, (Northwestel Mobility Inc) a spin-off of the Canadian company Northwestel

Science and technology
 Nautical mile (nmi)
 New Machine Interface, an instruction format used in the IBM i operating system
 Non-maskable interrupt, in computing
 NMI (gene)

Other uses
 No middle initial
 Nonprofit Marketplace Initiative, an initiative that sought to make individual philanthropic donations more evidence-based
 Northern Mariana Islands, a U.S. insular area
 Nyam language (ISO 639 code)

See also
 NRO Management Information System (NMIS), a computer network