| Abbreviation | Meaning | Category |
| I | italienische Bezeichnung | Andere |
| i. allg. | im allgemeinen | Andere |
| i.D. | im Dampf | Andere |
| i.e. | that is | Andere |
| i.m. | intramuskulär | Andere |
| i.p. | intraperitoneal | Andere |
| i.Tr. | in der Trockenmasse | Andere |
| i.v. | intravenös | Andere |
| IAEA | International Atomic Energy Agency | Andere |
| IARC | International Agency for Research on Cancer, Lyon, France | Andere |
| IATA-DGR | International Air Transport Association, Dangerous Goods Regulations | Andere |
| ib., ibid., ibd. | ibidem, ebenda | Periodika |
| ICAO | International Civil Aviation Organization | Andere |
| ID | Indonesia | Andere |
| IDS | Informationsverbund Deutschschweiz | Andere |
| IDS | Information Disclosure Statement | Andere |
| IE | internationale Einheit | Andere |
| %ig | prozentig | Andere |
| IIB | Institut Internationale des Brevets (now part of EPO) | Andere |
| IL | Israel | Andere |
| IMDG | International Maritime Dangerous Goods Code | Andere |
| IMO | Inter-Governmental Maritime Consultive Organization (in the past: IMCO) | Andere |
| inakt. | inaktiv | Andere |
| IND | Investigative New Drug (USA) | Andere |
| Ind. | Industrie | Andere |
| Inst. | Institut(ion) | Andere |
| internat. | international | Andere |
| IP | Intellectual Property | Andere |
| IPC | International Patent Classification | Andere |
| IPDL | Industrial Property Digital Library (JP) | Andere |
| IPEA | International Preliminary Examining Authority (PCT) | Andere |
| IPO | Initial Public Offering | Andere |
| IPRP | International Preliminary Examining Authority (PCT) | Andere |
| IR | infrared | Andere |
| ISA | International Searching Authority (PCT) | Andere |
| ISO | International Organization for Standardization | Andere |
| IT | Italy | Andere |
| ITC | International Trade Commission (USA) | Andere |
| IU | internationale Einheit | Andere |
| IUPAC | International Union of Pure and Applied Chemistry | Andere |
| IZ | Iod-Zahl | Andere |
