FH, Fh, or fh may refer to:
Businesses and institutions Danish Trade Union Confederation () Faculty of Humanities (The Hong Kong Polytechnic University) Fachhochschule, in German, a college of higher education Federation of the Swiss Watch Industry FH Futura International Airways (IATA code)
Science and technology Biology and medicine Familial hypercholesterolemia, a genetic disorder Factor H, a complement control protein Family history FH, a gene that encodes the enzyme fumarase
Chemistry Ferrihydrite (Fh), a widespread hydrous ferric oxyhydroxide mineral
Other uses in science and technology McDonnell FH Phantom, the U.S. Navy's first jet-powered fighter aircraft Falcon Heavy, Spacex's heavy lift reusable rocket Sport Fimleikafélag Hafnarfjarðar, Icelandic football club
Other uses fh (digraph); appears in Irish and some other languages Volvo FH, a range of trucks