NIGA
| Acronym | Definition |
|---|---|
| NIGA | National Indian Gaming Association |
| NIGA | Neutron-Induced Gamma Activity |
| NIGA | Nuclear Indirect Gamma Activity |
| NIGA | Nevada Insurance Guaranty Association (Las Vegas, NV) |
| NIGA | Northeastern Indiana Gaming Association (South Whitley, IN) |
| NIGA | National Issuing and Guaranteeing Association (India) |