- Pain disorder
- Panic attack
- Panic disorder
- Paranoia
- Paranoid personality disorder
- Paraphilias
- Parent management training
- Paroxetine
- Passionflower
- Pathological gambling disorder
- Pedophilia
- Peer groups
- Pemoline
- Perphenazine
- Person-centered therapy
- Personality disorders
- Pervasive developmental disorders
- Phencyclidine and related disorders
- Phenelzine
- Phonological disorder
- Pica
- Pimozide
- Play therapy
- Polysomnography
- Polysubstance dependence
- Positive symptoms
- Positron emission tomography
- Post-traumatic stress disorder
- Postpartum depression
- Premature ejaculation
