| Abbreviation | Definition |
|---|---|
| QRSTUVWXYZ | Question Reality So That U Validate What (e)Xists...(or) You're Zilch! |
| R | Rational |
| R | Receptive |
| R | Recluse |
| R | Resilience |
| R | Retardation |
| R.D.T | Rural Development Trust |
| RAP | Real Athletic Psychology |
| RAPT | Research And Psychology Training |
| RBE | Random Belief Equilibrium |
| RCFT | Rey complex Figure Test and Recognition Trial |
| RDI | Relationship Development Intervention |
| RDTP | Rational Drug Therapy Program |
| RGP | Recursive Group Psychotherapy |
| RISB | Rotter Incomplete Sentence Blank |
| RMET | Reading the Mind in the Eyes Test |
| RRism | Manifesto of the 'RR' suRRealists of Frankfurt, Germany |
| RSVP | Rapid Serial Visual Presentation |
| RTFP | Ralston Test of Finger-spelled Pseudowords |
| RTM | Representational Theory of Mind |