See Rare Diseases by First Letter (D)
- Dancing Eyes-dancing Feet Syndrome
- Darier Disease
- Dendritic Cell, Monocyte, B Lymphocyte, and Natural Killer Lymphocyte Deficie...
- Dengue Fever
- Denys-Drash Syndrome
- Depersonalization Disorder
- Dermatofibroma
- Dermatofibrosarcoma Protuberans
- Dermatomyositis
- Desmoid Tumor
- Desmoplastic Small Round Cell Tumor
- Devic Disease
- Dextrocardia
- Di Guglielmo's Syndrome
- Diamond-Blackfan Anemia
- Diaphyseal Medullary Stenosis With Malignant Fibrous Histiocytoma
- DICER1-related Pleuropulmonary Blastoma Cancer Predisposition Syndrome
- Diffuse Astrocytoma
- Diffuse Gastric Cancer
- Diffuse Scleroderma
- Diffuse Systemic Sclerosis
- Dihydroxyadeninuria
- Dilated Cardiomyopathy
- Dilated Cardiomyopathy With Hypergonadotropic Hypogonadism
- Diphtheria
- Dominant Ichthyosis Vulgaris
- Donnai-Barrow Syndrome
- Dopamine Beta Hydroxylase Deficiency
- Double Outlet Right Ventricle
- Dravet Syndrome
- Dubin-Johnson Syndrome
- Duchenne Muscular Dystrophy
- Duhring Brocq Disease
- Dysequilibrium Syndrome
- Dysferlinopathy
- Dyskeratosis Congenita
- Dyskinesia, Drug Induced
- Dystonia 11
- Dystonia 12
- Dystrophic Epidermolysis Bullosa
- Dystrophinopathy