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| G | |
| GESAMP | Group of Experts on the Scientific Aspects of Marine Pollution |
| GHS | Globally Harmonised System for classification and labelling of Chemicals |
| GMO | Genetically Modified Organism |
| H | |
| HAZCHEM | Emergency Action Codes for dangerous substances conveyed in bulk by road or rail |
| HAZMAT | US term for hazardous material |
| HIN | Hazard Identification Number |
| HMSO | Her Majesty's Stationery Office |
| HSC | Health and Safety Commission |
| HSE | Health and Safety Executive |
| HSWA | Health and Safety at Work etc Act 1974 |
| I | |
| IAEA | International Atomic Energy Agency |
| IARC | International Agency for the Research on Cancer |
| IATA | International Air Transport Association. |
| IBC | Intermediate Bulk Container |
| ICAO | The International Civil Aviation Organisation |
| ICAO TI | Technical Instructions for the Safe Transport of Dangerous Goods by Air |
| ID50 | Infectious Dose 50, quantity of a substance required to infect 50% of a target population by a given route |
| IMDG Code | The International Maritime Dangerous Goods Code |
| Immiscible | Does not mix with water |
| IMO | International Maritime Organisatione |
| IOMC | Inter-organisation Programme on the Sound Management of Chemicals |
| IPCS | International Programme on Chemical Safety |
| ISO | International Standards Organisation |