| Abbreviation | Definition |
|---|---|
| NUJ | National Union of |
| NUJ | Nigerian Union of Journalism |
| NUJ | Nigerian Union of Journalists |
| NUKS | National Union of Kuwaiti Students |
| NULIS | Norwich Union Life Insurance Society |
| NULL | Norwich Union Linked Life |
| NUM | National Union of Miners |
| NUM | National Union of Mineworkers |
| NUM | National Union of Mineworkers (South Africa) |
| NUMP | National Union of Meat Processors |
| NUMSA | National Union of Metalworkers of South Africa |
| NUMSA | National Union of Metalworkers of South African |
| NUNW | National Union of Namibian Workers |
| NUP | Nigeria Union of Pensioners |
| NUPE | National Union of Public Employees |
| NUPENG | Nigeria Union of Petroleum & Natural Gas Workers |
| NUPSW | National Union of Public Servant Workers |
| NUPSW | National Union of Public Service Workers |
| NUPSW | National Union of Public Services Workers |
| NUPSWU | National Public Service Workers Union |