More than a glossary, "A to Z" provides definitions of key terms followed by references to relevant parts of "The law" and "The law in practice" sections where the terms appear, and to the relevant rules of IHL.
- Immunities
- Implementation
- Incendiary weapons
- Indecent assault (protection against)
- Indicted or convicted persons
- Indiscriminate attacks
- Individual criminal responsibility
- Information (transmission of)
- Installations containing dangerous forces
- Inter-American Court of Human Rights / Inter-American Commission on Human Rights
- Internal disturbances and tensions
- Internally displaced persons (IDPs)
- International administration
- International armed conflict
- International Committee of the Red Cross
- International Conferences of the RCRC
- International Court of Justice
- International Criminal Court
- International criminal law
- International Criminal Tribunal for Rwanda
- International Criminal Tribunal for the Former Yugoslavia
- International Federation of RCRC Societies
- International Humanitarian Fact-Finding Commission
- Internationalized internal armed conflict
- Internees / Internment
- Internment
- Interpretation
- Interrogation
- Intervention
- Interview without witnesses
- Ius ad bellum, ius in bello
- Ius cogens