| Acronym | Definition |
|---|
| III➣3 (Roman numeral) |
| III➣Insurance Information Institute |
| III➣Regiment (Graphical Representation/Military) |
| III➣International Industries, Inc. (Washington, DC) |
| III➣Industry Institute Interaction (India) |
| III➣Innovative Interfaces Inc. |
| III➣International Information Infrastructure |
| III➣Institute for Information Industry |
| III➣Ispat Inland, Inc. (Indiana) |
| III➣Interfaculty Initiative in Information Studies (Japan) |
| III➣Intel Interchangeability Initiative |
| III➣International Information Issues |
| III➣Instituto Indigenista Interamericano (Inter-American Indian Institute) |
| III➣Interstate Identification Index |
| III➣Institute of Infection and Immunity (Canada) |
| III➣Triremis (Latin: Triremes, epigraphy) |
| III➣Insurance Institute of India |
| III➣Integrated Information Infrastructure |
| III➣Interactive Investor International |
| III➣Incapacitating Illness or Injury |
| III➣Informis Infinitas Inhumanitas (band) |
| III➣Immediate Intensive Intervention |
| III➣Integrated Imagery and Intelligence |
| III➣Intelligence Integrity Intensity |
| III➣Indian Institute of Immunology |
III - the cardinal number that is the sum of one and one and one
iii - being one more than two