| Abk. | Bedeutung | Kontext |
| R | Wiederstand | Physik |
| R | Ressourcen | VWL |
| RAC | Royal Automobil Club | |
| RADAR | Radio Detection and Ranging | |
| RAID | Redundant Arrays if Inexpensive Disks | |
| RAM | Random Access Memory | |
| RAO | Reichsabgabenordnung | |
| RAP | Rechnungsabgrenzungsposten | BWL |
| RAS | Remote Access Service | Microsoft |
| RALU | Register-ALU, Rechenwerk | |
| RBF | Rentenbarwertfaktor | |
| RCA | Ripple Carry Adder | |
| RCP | Remote Copy Protocol | Netzwerke, TCP/IP |
| RCPT | Recipient | |
| RCS | Revision Control System | |
| RD | Receive Data | RS-232 |
| RDW | Record Descriptor Word | |
| REQ | Request | |
| RegE | Regierungsentwurf | |
| REQOTE | Request for Quotation | EDIFACT |
| resp. | respektive | |
| RFC | Request For Comments | |
| RFH | Reichsfinanzhof | |
| RG | Reichsgericht | |
| RID | Rechnerinterne Darstellung | |
| RIP | Routing Information Protocol | |
| RIP | Requiescat In Pace | |
| RISC | Reduced Instruction Set Computer | |
| RLZ | Raumladungszone | |
| RM | Repository Manager | IBM |
| RMI | Remote Method Invocation | Java |
| Rn. | Randnummer | |
| ROI | Return on investment | |
| ROM | Read Only Memory, Festwertspeicher | |
| RPC | Remote Procedure Call | |
| RPN | Reverse Polnish Notation | |
| RPS | Rotational Position Sensing | Fesplatten-Controller |
| RRDS | Relative Record Data Set | VSAM |
| RSH | Remote Shell | Netzwerke, TCP/IP |
| RStBl | Reichssteuerblatt | |
| RTL | Radio Television Luxembourg | |
| RTP | Realtime Transport Protocol | |
| RTSP | Realtime Streaming Protocol | |
| RV | Rentenversicherung | |
| RWI | Rheinisch-westfälisches Wirtschaftsforschungs-Institut, Essen | |