| Abbreviation | Definition |
|---|---|
| NTEU | National Treasury Employees Union |
| NTIU | Nigeria Trade and Investment Union |
| NTMU | National Trouble Makers Union |
| NTMU | New Testament Missionary Union |
| NTSU | Nottingham Trent Students' Union |
| NTU | Natl Taxpayers Union |
| NTU | Newark Teachers Union |
| NTUB | National Trade Union Bodies |
| NTUC | National Trade Union Congress |
| NTUC | National Trade Unions Confederation |
| NTUC | National Trades Union Congress |
| NTUC | National Trades Union Congress (Singapore) |
| NTUC | Nepal Trade Union Congress |
| NTUC | Never Trust Union Chiefs |
| NTUCB | National Trade Union Congress of Belize |
| NTUF | Nepal Trade Union Federation |
| NTUF | Nepal Trade Union Federations |
| NTUI | New Trade Union Initiative |
| NUAF | National Union of Albanian Farmers |
| NUAP | National Union Advantage Program |