| Pseudois nayaur | Bharal |
| Pseudolarix | Pseudolarix |
| Pseudomonas aeruginosa | Pseudomonas aeruginosa |
| Pseudomonas syringae | Pseudomonas syringae |
| Pseudopimelodidae | Pseudopimelodidae |
| Pseudoplatystoma | Pseudoplatystoma |
| Pseudoplatystoma fasciatum | Catfish |
| Pseudotsuga | Douglas-fir |
| Pseudotsuga macrocarpa | Bigcone Douglas-fir |
| Psiax | Psiax |
| Psicoacústica | Psychoacoustics |
| psicoanalista | psychoanalyst |
| psicoanalizar | psychoanalyze |
| psicoanalítico | psychoanalytic |
| psicoanálisis | psychoanalysis |
| Psicobloc | Deep-water soloing |
| psicodélico | psychedelic |
| Psicofonía | Electronic voice phenomena |
| Psicohistoria | Psychohistory |
| psicología | psychology |
| psicología ambiental | environmental psychology |
| Psicología analítica | Analytical psychology |
| psicología clínica | clinical psychology |
| Psicología cognitiva | Cognitive psychology |
| Psicología conductista | Behaviorism |
| Psicología de la Gestalt | Gestalt psychology |
| Psicología de la Religión | Psychology of religion |
| Psicología del color | Color symbolism and psychology |
| Psicología del desarrollo | Developmental psychology |
| Psicología educacional | Educational psychology |
| Psicología humanista | Humanistic psychology |
| Psicología médica | Medical psychology |
| Psicología popular | Folk psychology |
| Psicología positiva | Positive psychology |
| psicología social | social psychology |
| Psicología transpersonal | Transpersonal psychology |
| psicológico | psychological |
| psicomotor | psychomotor |
| Psiconauta | Psychonaut |
| Psicopedagogia | Psychopedagogy |
| psicopático | psychopathic |
| psicoquinesis | psychokinesis |
| psicosis | psychosis |
| psicosomático | psychosomatic |
| psicoterapia | psychotherapy |
| Psicoterapia psicodélica | Psychedelic psychotherapy |
| psicóloga | psychologist |
| psicólogo | psychologist |
| psicópata | psychopath |
| Psidium guajava | Psidium guajava |
| Psilocybe cubensis | Psilocybe cubensis |
| Psilocybe semilanceata | Psilocybe semilanceata |
| Psilotaceae | Psilotaceae |
| Psilotopsida | Psilotopsida |
| Psilotum | Psilotum |
| Psiloxylon | Psiloxylon |
| psique | psyche |
| psiquiatra | psychiatrist |
| psiquiatría | psychiatry |
| psiquico | mental |
| psiquiátrico | psychiatric |
| psitacosis | psittacosis |
| Psittacidae | Parrot |
| Psittaciformes | Parrot |
| Psittacinae | Psittacinae |
| Psittacula | Psittacula |
| Psittacula derbiana | Derbyan Parakeet |
| Psittacula eques | Mauritius Parakeet |
| Psittacula krameri | Rose-ringed Parakeet |
| Psittacus erithacus | African Grey Parrot |
| Pskov | Pskov |
| PSNR | Peak signal-to-noise ratio |
| Psoasilíaco | Psoas major muscle |
| Psocoptera | Psocoptera |
| Psophia crepitans | Grey-winged Trumpeter |
| psoriasis | psoriasis |
| Psunj | Psunj |
| Psusenes I | Psusennes I |
| Psusenes II | Psusennes II |
| Psusenes III | Psusennes III |
| PSV Eindhoven | PSV Eindhoven |
| PSX | PSX emulator |
