NYI
| Acronym | Definition |
|---|---|
| NYI | New York Islanders (NHL) |
| NYI | New York Institute of Photography |
| NYI | Not Yet Implemented |
| NYI | Nazarene Youth International |
| NYI | New York Internet Company (internet service provider; est. 1996; New York, NY) |
| NYI | New York Initiative (citizen infrastructure group) |
| NYI | National Youth Institute (American Red Cross) |