- Deinstitutionalization
- Delirium
- Delusional disorder
- Delusions
- Dementia
- Denial
- Dependent personality disorder
- Depersonalization
- Depersonalization disorder
- Depression and depressive disorders
- Desipramine
- Detoxification
- Developmental coordination disorder
- Diagnosis
- Diagnostic and Statistical Manual of Mental Disorders
- Diazepam
- Diets
- Diphenhydramine
- Disease concept of chemical dependency
- Disorder of written expression
- Dissociation and dissociative disorders
- Dissociative amnesia
- Dissociative fugue
- Dissociative identity disorder
- Disulfiram
- Divalproex sodium
- Donepezil
- Doxepin
- Dual diagnosis
- Dyspareunia
