| Acronym | Definition |
|---|
| NCOI➣National Committee on Inquiry (National Association of Social Workers) |
| NCOI➣National Competition in Organ Improvisation (American Guild of Organists) |
| NCOI➣Nederlands Commercieel Opleidings Instituut (Dutch: Dutch Commercial Training Institute) |
| NCOI➣North County Orthopedics, Inc. (Missouri) |
| NCOI➣National Congress on Integrity |