Ida
- 243 Ida
- Budapest Treaty
- Cavan–Monaghan
- Danish Society of Engineers
- Darwinius
- I.D.A. (drug store)
- ID A
- IDA Ireland
- IDA*
- IDABC
- Ida (Middleverse)
- Ida (band)
- Ida (barony)
- Ida (film)
- Ida (given name)
- Ida (mother of Minos)
- Ida (nurse of Zeus)
- Ida (plant)
- Ida (river)
- Ida (singer)
- Ida (surname)
- Ida (sword)
- Ida (yoga)
- Ida County, Iowa
- Ida Facula
- Ida Galaxy
- Ida Ridge
- Ida Township, Douglas County, Minnesota
- Ida Township, Michigan
- Ida Valley
- Ida, Arkansas
- Ida, Eastern Cape
- Ida, Kentucky
- Ida, Louisiana
- Ida, Nigeria
- Ida, Russia
- Ida, Virginia
- Idaho Falls Regional Airport
- Idas (disambiguation)
- Idaxo-Isuxa-Tiriki language
- Ila (Hinduism)
- Iminodiacetic acid
- In Defense of Animals
- Incremental Dynamic Analysis
- Indian Dental Association
- Individual Development Account
- Industrial Denatured Alcohol
- Infocomm Development Authority of Singapore
- Information Design Association
- Institute for Defense Analyses
- Intel Dynamic Acceleration
- Interactive Disassembler
- International Dark-Sky Association
- International Depositary Authority
- International Desalination Association
- International Development Association
- International Disability Alliance
- International Dispensary Association Foundation
- International Docking Adapter
- International Documentary Association
- International Dyslexia Association
- Internet Download Accelerator
- Investment Dealers Association of Canada
- Iron-deficiency anemia
- Isotope dilution
- Ita (disambiguation)
- Itta
- List of U.S. state abbreviations
- Mount Ida (disambiguation)
- Otto Du Plessis Pass
- Princess Ida
- SPSS
- Shelby Township, Blue Earth County, Minnesota
- Spinal anaesthesia
- Tropical Storm Ida (disambiguation)
- USS Ida (1863)
- railway stations in Nigeria