| Febriphobia | fear of fever (see list of phobias) |
| Felinology | study of felines (see list of branches of science) |
| Felinophobia | fear of cats (see list of phobias) |
| Fibriophobia | fear of fever (see list of phobias) |
| Fibriphobia | fear of fever (see list of phobias) |
| Finance | study of money management (see list of branches of science) |
| Floristry | study of cultivating and selling flowers (see list of branches of science) |
| Fluid dynamics | study of flow of fluids (see list of branches of science) |
| Fluid mechanics | study of fluids behaviour at rest and in motion (see list of branches of science) |
| Fluid statics | study of fluids behaviour at rest (see list of branches of science) |
| Fluviology | study of watercourses (see list of branches of science) |
| Folkloristics | study of folklore and fables (see list of branches of science) |
| Forestry | study of the management of forests (see list of branches of science) |
| Fracture mechanics | study of the propagation of cracks in materials (see list of branches of science) |
| Francophobia | fear of France or French culture (see list of phobias) |
| Frigophobia | fear of cold or cold things (see list of phobias) |
| Futurology | study of future (see list of branches of science) |
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