Acronyms
- Danish Society of Engineers (Danish: Ingeniørforeningen i Danmark), an association for engineers and others in technology
- I.D.A. (drug store), originally Independent Druggists' Alliance, a Canadian drug store now part of the Katz Group of Companies
- IDA Ireland, formerly the Industrial Development Authority
- Idaho Falls Regional Airport, IATA airport code:IDA
- In Defense of Animals, a non-profit organisation for animal rights activism
- Indian Dental Association
- Individual Development Accounts
- Influence diagrams approach in human risk and reliability assessment
- Infocomm Development Authority of Singapore, a statutory board of the Singapore Government
- Institute for Defense Analyses, a U.S. non-profit corporation that administers three federally funded research and development centers (FFRDCs)
- Integrated Design Associates, a Hong Kong based architectural firm
- Interactive Disassembler (now IDA Pro), a popular software disassembler tool for reverse engineering
- International Dark-Sky Association, a U.S.-based non-profit organization
- International Depositary Authority, established by the Budapest Treaty for the deposit the biological material for the recognition of patents
- International Design Excellence Awards, an award program co-sponsored by BusinessWeek magazine and Industrial Designers Society of America (IDSA)
- International Desalination Association, a global organization dedicated to desalination, desalination technology and water reuse
- International Development Association of the World Bank
- International Disability Alliance, an international alliance of individuals to defend the rights of those with disabilities
- International Documentary Association, a non-profit organization promoting documentary film, video and new media
- International Dyslexia Association, a non-profit education and advocacy organization
- Internet Download Accelerator, a download accelerator software created by WestByte
- Russian IDA71 military and naval rebreather, are makes of Russian frogman's rebreather
- Investment Dealers Association of Canada, now part of the Investment Industry Regulatory Organization of Canada
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