| I |
Island; Ireland, used chiefly of creations of titles of honour of; 'The First' in a sequence of I, II, Ill etc |
| i/c |
in charge; in command , |
| IA |
Indian Army; Iowa |
| IAM |
Institute of Advanced Motorists; Institute of Aviation Medicine |
| IAPS |
Incorporated Association of Preparatory Schools |
| IARO |
Indian Army Reserve of Officers |
| IASC |
International Arctic Science Committee |
| IATA |
International Air Transport Association |
| IBA |
Independent Broadcasting Authority; International Bar Association |
| IBRD |
International Bank for Reconstruction and Development (World Bank) |
| ICA |
Institute of Contemporary Arts; Institute of Chartered Accountants in England and Wales |
| ICAO |
International Civil Aviation Organization |
| ICC |
International Chamber of Commerce |
| ICD |
Iuris Canonici Doctor (Doctor of Canon Law); Independence Commemorative Decoration (Rhodesia) |
| ICE |
Institution of Civil Engineers |
| ICFTU |
International Confederation of Free Trade Unions |
| IChemE |
Institution of Chemical Engineers |
| ICI |
Imperial Chemical Industries |
| ICL |
International Computers Ltd |
| ICM |
International Confederation of Midwives |
| ICOMOS |
International Council of Monuments and Sites |
| ICRC |
International Committee of the Red Cross |
| ICRF |
Imperial Cancer Research Fund |
| ICS |
Indian Civil Service |
| ICSTIS |
Independent Committee for Supervision of Telephone Information Services |
| ICSTM |
Imperial College of Science, Technology and Medicine, London |
| ID |
Independence Decoration (Rhodesia); Idaho |
| IDA |
International Development Association |
| idc |
completed a course at, or served for a year on the Staff of, the Imperial Defence College |
| IEA |
Institute of Economic Affairs |
| IEE |
Institution of Electrical Engineers |
| IEng |
Incorporated Engineer |
| IFS |
Irish Free State; Indian Forest Service |
| IG |
Instructor in Gunnery |
| IISS |
International Institute of Strategic Studies |
| ILEA |
Inner London Education Authority |
| ILP |
Independent Labour Party |
| ILR |
Independent Local Radio; International Labour Review |
| IM |
Individual Merit |
| IMA |
International Music Association; Institute of Mathematics and its Applications |
| IMCB |
International Management Centre from Buckingham |
| IME |
Institute of Medical Ethics |
| IMechE |
Institution of Mechanical Engineers |
| IMEDE |
Institut pour l'Etude des Methodes de Direction de I'Entreprise |
| IMF |
International Monetary Fund |
| IMinE |
Institution of Mining Engineers |
| Imp |
Imperial |
| IMS |
Indian Medical Service; Institute of Management Services; International Military Staff |
| IN |
Indian Navy; Indiana |
| Inc |
Incorporated |
| Ind |
Independent |
| Industs |
Industries |
| Inf |
Infantry; Information |
| Inspr |
Inspector |
| Inst |
Instructor; Institute; Institution |
| Instr |
Instructor |
| insur |
insurance |
| Intell |
Intelligence |
| Internat |
International |
| IOD |
Institute of Directors |
| IoM |
Isle of Man |
| IoW |
Isle of Wight |
| IPA |
International Publishers' Association |
| IPCS |
Institution of Professional Civil Servants |
| IPlantE |
Institution of Plant Engineers |
| IPM |
Institute of Personnel Management |
| IPPR |
Institute for Public Policy Research |
| IPPS |
Institute of Physics and The Physical Society |
| IProdE |
Institution of Production Engineers |
| IPS |
Indian Police Service; Indian Political Service; Institute of Purchasing and Supply |
| IPU |
Inter-Parliamentary Union |
| IRA |
Irish Republican Army |
| IRRV |
(Fellow/Member of) Institute of Revenues, Rating and Valuation |
| IS |
International Society of Sculptors, Painters and Gravers |
| ISC |
Indian Staff Corps; Imperial Service College, Haileybury |
| ISIS |
Independent Schools Information Service |
| ISM |
Incorporated Society of Musicians |
| ISO |
Imperial Service Order; International Organization for Standardization |
| IT |
Information Technology; Indian Territory (US) |
| ITA |
Independent Television Authority (later IBA) |
| ITB |
Industry Training Board |
| ITC |
International Trade Centre; Independent Television Commission |
| ITN |
Independent Television News |
| ITV |
Independent Television |
| IUCN |
World Conservation Union (formerly International Union for the Conservation of Nature and Natural Resources) |
| IVS |
International Voluntary Service |
| IWEM |
Institution of Water and Environmental Management |
| IY |
Imperial Yeomanry |
