NSY
| Acronym | Definition |
|---|---|
| NSY | Naval Shipyard |
| NSY | New Scotland Yard |
| NSY | Nagoya-Shibata-Yasuda (mice) |
| NSY | North Somerset Yeomanry (UK) |
| NSY | North Shore YMCA (Young Men's Christian Association; Massachusetts) |
| NSY | Network South Yorkshire (est. 2005; bus transportation; UK) |