- Attention-deficit/hyperactivity disorder
- Autism
- Aversion therapy
- Avoidant personality disorder
- Barbiturates
- Beck Depression Inventory
- Behavior modification
- Bender Gestalt Test
- Benztropine
- Beta blockers
- Bibliotherapy
- Binge eating
- Biofeedback
- Biperiden
- Bipolar disorder
- Bipolar disorders
- Body dysmorphic disorder
- Bodywork therapies
- Borderline personality disorder
- Brain
- Breathing-related sleep disorder
- Brief psychotic disorder
- Bulimia nervosa
- Bupropion
- Buspirone
- Caffeine-related disorders
- Cannabis and related disorders
- Carbamazepine
- Case management
- Catatonia
