| Imperial Federation League |
Pressure/campaign organisations |
|
| Imperialist Union |
Pressure/campaign organisations |
|
| Imperial League |
Miscellaneous |
|
| Imperial Society of Knights |
Miscellaneous |
|
| Income Tax Payers Society |
Miscellaneous |
|
| India Defence League |
Miscellaneous |
|
| Indian Workers' Association |
Pressure/campaign organisations |
|
| Industrial Christian Fellowship |
Religious organisations |
|
| Industrial Society |
Miscellaneous |
|
| Institute of Bankers |
Miscellaneous |
|
| Institute of Civil Engineers |
Miscellaneous |
|
| Institute of Clayworkers |
Pressure/campaign organisations |
|
| Institute of Directors |
Pressure/campaign organisations |
|
| Institute of Mining |
Miscellaneous |
|
| Institute of Mining Engineers |
Miscellaneous |
|
| Institute of Naval Architects |
Professional/trade organisations |
|
| Institute of Petroleum Technologists |
Miscellaneous |
|
| Institute of Public Relations |
Professional/trade organisations |
|
| Institute of Race Relations |
Pressure/campaign organisations |
|
| Institute of Shipbuilders and Engineers |
Miscellaneous |
|
| Institute of Surveyors |
Professional/trade organisations |
|
| Institute of Workers' Control |
Pressure/campaign organisations |
|
| Institute of World Affairs |
Miscellaneous |
|
| International Arbitration League |
International organisations |
|
| International Co-operative Alliance |
Pressure/campaign organisations |
|