Объединение лондонских страховщиков (в страховых оговорках)
- Institute for Social Research
- Institute of Bankers'
- Institute of Chartered Accountants of England and Wales
- Institute of Chartered Accountants of Ireland
- Institute of Cost and Works Accountants
- Institute of Internal Auditors
- Institute of Management Consultants
- Institute of Population Problems
- Institute of Work Study Practitioners
- American Institute of Accountants
- American Institute of Bankers
- American Institute of Certified Public Accountants
- American Institute of Cooperation
- American Institute of Public Opinion
- Central Family Planning Institute
- Controllers' Institute of America
- Demographic Institute
- Edison Electric Institute
- European Institute of Business Administration
- Inter-American Institute of Agricultural Sciences
- Inter-American Statistical Institute
- International Institute of Public Finance
- International Institute of Social and Political Sciences
- International Thrift Institute
- Life Insurance Institute
- National Institute of Child Health and Human Development
- National Institute of Demographic Studies
- National Institute of Investment Companies
- Population Growth Action Research Institute
- Smithsonian Institute