| Acronym | Meaning |
 | REM | Release Engine Mechanism |
 | REM | Release Engine Module |
 | REM | Release Escape Mechanism |
 | REM | Release-Engage Mechanism |
 | REM | Roentgen Equivalent In Man |
 | REN | RAD Rendezvous Radar |
 | REND | Rendezvous |
 | REO | Request |
 | REO | Require |
 | REOD | Required |
 | REPL | Replace |
 | REPR | Repressurization |
 | REPRO | Reproduction |
 | REQN4TS | Requirements (RQN4TS Preferred) |
 | RES | Reserve |
 | RES | Reservoir |
 | RESID | Residual |
 | RESIS | Resistance |
 | RESP | Responsibility |
 | RESVR | Reservoir |
 | RET | Retract |
 | RETEN | Retention |
 | RETRO | Retro Controller (NASA) |
 | RETRO | Retrofire |
 | RETRO | Retrofire Officer |
 | RETRV | Retrieve |
 | REV | Reverse |
 | REV | Review |
 | REV | Revision |
 | REV | Revolution |
 | RF | Communications Support |
 | RF | Radio Frequency |
 | RF | Radio Frequency |
 | RF | Right Forward |
 | RF-TK | Radio Frequency Tracking |
 | RFA | Request For Action |
 | RFA | RF Authorization (Frequency) |
 | RFB | Ready For Baseline |
 | RFB | Request For Bid |
 | RFC | Radio Frequency Charts |
 | RFC | Request For Change |
 | RFC | Request For Change Revolution |
 | RFCP | Request For Computer Program |
 | RFD | Requirements Formulation Document |
 | RFE | Request For Estimate |
 | RFEI | Request For Engineering Information |
 | RFI | Radio Frequency Interference |
 | RFI | Remote Facility Inquiry |
 | RFI | Remote File Inquiry |
 | RFI | Request For Information |