See Rare Diseases by First Letter (F)
- Fabry Disease
- Facioscapulohumeral Muscular Dystrophy
- Factor VII Deficiency
- Factor X Deficiency
- Factor XIII Deficiency
- Fallopian Tube Cancer
- Familial Adenomatous Polyposis
- Familial Cold Autoinflammatory Syndrome
- Familial Colorectal Cancer
- Familial Dysautonomia
- Familial Encephalopathy With Neuroserpin Inclusion Bodies
- Familial Exudative Vitreoretinopathy
- Familial HDL Deficiency
- Familial Hemiplegic Migraine
- Familial Hemiplegic Migraine Type 1
- Familial Hyperinsulinism
- Familial Hypertrophic Cardiomyopathy
- Familial Isolated Hyperparathyroidism
- Familial Isolated Pituitary Adenoma
- Familial Mediterranean Fever
- Familial Prostate Cancer
- Familial Thoracic Aortic Aneurysm and Dissection
- Familial Transthyretin Amyloidosis
- Fanconi Anemia
- Fanconi Bickel Syndrome
- Fanconi Renotubular Syndrome
- Fatal Familial Insomnia
- Felty's Syndrome
- Fetal Alcohol Spectrum Disorders
- Fetal Edema
- Fetal Macrosomia
- Fibrinogen Deficiency, Congenital
- Fibrosarcoma
- Fibrous Dysplasia
- Focal Dermal Hypoplasia
- Focal Dystonia
- Focal Facial Dermal Dysplasia
- Follicular Lymphoma
- Formaldehyde Poisoning
- Fournier Gangrene
- Fragile X Syndrome
- Frambesia Tropica
- Fraser Syndrome
- Frasier Syndrome
- Freeman Sheldon Syndrome
- Frey's Syndrome
- Friedreich Ataxia
- Frontotemporal Dementia
- Fryns Syndrome
- Fucosidosis