IHI can refer to:
- Ifakara Health Institute, a health research organization in Tanzania
- Information Holdings Inc., part of The Thomson Corporation since 2004
- Institute for Healthcare Improvement, an independent not-for-profit organization helping to lead the improvement of health and health care
- IHI Corporation, formerly known as Ishikawajima-Harima Heavy Industries, a Japanese company which produces ships, aero-engines, and other machinery
- Ice Hockey Iceland, ÍHÍ (Icelandic: Íshokkísamband Íslands)
See also
- Ihi (Bel marriage), Newar girls' mock-marriage to the bel fruit in Nepal
- Ihi (goddess), the goddess of wisdom and learning in Tahitian mythology