| Abbreviation | Definition |
|---|---|
| NIB | National Insurance Board |
| NIBG | National Insurance Brokerage Group |
| NIC | National Insurance Contributions |
| NICB | National Insurance Crime Bureau |
| NICOA | Nationwide Insurance Company of America |
| NICON | National Insurance Commission Of Nigeria |
| NICON | National Insurance Corporation Of Nigeria |
| NID | National Insurance Department |
| NIG | National Insurance and Guarantee |
| NIG | National Insurance Group |
| NIG | National Insurance Guarantee |
| NIGA | Nevada Insurance Guaranty Association |
| NIIA | Nevada Independent Insurance Agents |
| NIIS | National Injury Insurance Scheme |
| NIIS | National Insurance Inspection Services |
| NIIS | Nebraska Insurance Information Service |
| NIIS | Northshore International Insurance Services |
| NIMC | National Insurance Marketing Corporation |
| NIPR | National Insurance Producer Registry |
| NIQ | Not Insurance Quality |