IHI can refer to: Ifakara Health Institute, a health research organization in Tanzania Information Holdings Inc., part of the Thomson Corporation since 2004 IHI Corporation, formerly known as Ishikawajima-Harima Heavy Industries, a Japanese manufacturing company Ice Hockey Iceland, ÍHÍ (Icelandic: Íshokkísamband Íslands) Innovative Health Initiative Joint Undertaking (IHI), a European Union pharmaceutical research initiative
See also Ihi, a ceremonial marriage ritual in Nepal Ihi (goddess), the goddess of wisdom and learning in Tahitian mythology