| RAID | Redundant Array Of Independent Disks | - | Computer and Internet |
| RAM | Random Access Memory | - | Computer and Internet |
| RDF | Resource Description Framework | - | Computer and Internet |
| RDRAM | Rambus Dynamic Random Access Memory | - | Computer and Internet |
| RGB | Red Green Blue | - | Computer and Internet |
| RISC | Reduced Instruction Set Computing | - | Computer and Internet |
| ROM | Read-Only Memory | - | Computer and Internet |
| RPC | Remote Procedure Call | - | Computer and Internet |
| RPM | Revenue Per 1,000 Impressions. (M Is The Roman Numeral For 1,000) | - | Computer and Internet |
| RSS | RDF Site Summary | - | Computer and Internet |
| RTE | Runtime Environment | - | Computer and Internet |
| RTF | Rich Text Fomat | - | Computer and Internet |
| RUP | Rational Unified Process | - | Computer and Internet |
