FH, Fh, or fh can mean:
- Medicine and biology
- Familial hypercholesterolemia, a genetic disorder
- Family History (clinical use)
- Factor H, a complement control protein
- Fundus hypertonicus, a Latin designation for hypertensive retinopathy
- Sport
- Field Hockey, a sport
- FH Hafnarfjördur, Icelandic football club
- Education
- Faculty of Humanities (The Hong Kong Polytechnic University)
- German: Fachhochschule, college of higher education
- Other
- Federation of the Swiss Watch Industry FH
- Ferrihydrite (Fh), a widespread hydrous ferric oxyhydroxide mineral
- F. Hinds, a jewellery retailer
- Fire hydrant,
- Freehold (law), a type of fee-simple property
- Full house (poker)
- The Latin alphabet digraph fh; while not used in English, it appears Irish and some other languages
- The Flat Hat, a student newspaper at the College of William & Mary
- The IATA code for Futura International Airways
- The McDonnell FH Phantom, the US Navy's first jet fighter.
- Macromedia FreeHand, software package