IH
- IHÉS – (i) Institut des Hautes Études Scientifiques (French, Institute of Advanced Scientific Studies)
- IHH – (i) Idiopathic Hypogonadotropic Hypogonadism
- IHO – (i/a) International Hydrographic Organization
- IHR – (i) Institute for Historical Review
- IHSI - Institutum Historicum Societatis Iesu (Jesuit Historical Institute)
Read more about this topic: List Of Acronyms And Initialisms: I