| Acronym | Definition |
|---|
| IgA | Immunoglobulin A (antibody) |
| IGA | Intergovernmental Agreement |
| IGA | Independent Glass Association |
| IGA | International Glaucoma Association |
| IGA | International Geothermal Association |
| IGA | International Goat Association (Little Rock, Arkansas) |
| IGA | Indiana Golf Association |
| IGA | Income Generating Activity |
| IGA | Inagua, Bahamas (Airport Code) |
| IGA | Independent Grocers Alliance |
| IGA | Investigator's Global Assessment |
| IGA | Interested Government Agency |
| IGA | Intergranular Attack |
| IGA | Independent Grocers Association |
| IGA | Institute of Group Analysis |
| IGA | Independent Grocers of Australia (Australia) |
| IGA | International Island Games Association |
| IGA | Idaho Golf Association |
| IGA | Interactive Genetic Algorithm (interactive evolutionary computation) |
| IGA | International Gay Association (now International Lesbian and Gay Association) |
| IGA | Integrated Graphics Array |
| IGA | Improved Gaussian Approximation |
| IGA | Illumina Genome Analyzer (genomics) |
| IGA | Indonesian Gas Association (Jakarta, Indonesia) |
| IGA | Institute for Gulf Affairs |
| IGA | International Governmental Agreement |
| IGA | Integrating Gyro Accelerometer |
| IGA | Interleaver Growth Algorithm |
| IGA | Inhaled Gas Analyzer |
| IGA | International Graduate Achievement |
| IGA | Inhomogeneous Green's Function Approach |
| IGA | International Growers Association |
| IGA | Inspector General Act of 1978 |