| Acronym | Definition |
|---|
| FII | Fundo de Investimento Imobiliário (Brazilian real estate investment fund) |
| FII | Federated Investors Inc. (Pittsburgh, PA) |
| FII | Flight Instructor Instrument (aviation test) |
| FII | Font Information Interchange |
| FII | Foreign Institutional Investor |
| FII | Financial Investments, Inc. (various locations) |
| FII | Foreign Indirect Investment |
| FII | Financial Instrument Identifier |
| FII | Flagship Industries, Inc. (Smithtown, NY) |
| FII | Falling Into Infinity (Dream Theater album) |
| FII | Fundación Instituto de Ingeniería (Caracas, Venezuela) |
| FII | Federation of Icelandic Industries |
| FII | Financial Information, Inc. |
| FII | Federal Item Identification |
| FII | Foreign Intelligence Information |
| FII | Fluides Ingénierie Internationale (French: International Engineering Fluids) |
| FII | Fabrication or Induction of Illness (formerly known as Munchausen Syndrome by Proxy) |
| FII | Florida-Israel Institute |
| FII | Federal Information Infrastructure |
| FII | Fiber Innovations, Inc |
| FII | Film Institute of India |
| FII | Factor 2 Activity |
| FII | Florida Innocence Initiative, Inc |