| RED | Clarion Modula-2 Path information 
| Others |
| RED | HORSE Rapid Engineers Deployable Heavy Operations Repair Squadron, Engineers
| Others |
| RED | Race Engine Development
| Others |
| RED | Random Early Detection
| Others |
| RED | Random Early Discard
| Others |
| RED | Rapid Extraction Desk
| Others |
| RED | Read Every Day
| Others |
| RED | Ready to Enter the Dark
| Others |
| RED | Real Economic Development
| Others |
| RED | Real Enterprise Development
| Others |
| RED | Real Estate Development
| Others |
| RED | Really Entertaining Diversion
| Others |
| RED | Realone Enterprise Desktop
| Others |
| RED | Redfern Everleigh Darlington
| Others |
| RED | Reduce
| Others |
| RED | Reduction
| Others |
| RED | Regional Economic Development
| Others |
| RED | Register Of Employees Dismissed
| Others |
| RED | Rehorn Ebert And Dan
| Others |
| RED | Reliable Excavation Demolition
| Others |
| RED | Remember Everyone Deployed
| Others |
| RED | Remote Execution Daemon
| Others |
| RED | Renewable Emulsified Diesel
| Others |
| RED | Renewable Energy Directive
| Others |
| RED | Reporting Exposure Draft
| Others |
| RED | Research Evolved Design
| Others |
| RED | Resistive Exercise Device
| Others |
| RED | Rest Elevation Direct
| Others |
| RED | Restricted EDitor
| Others |
| RED | Retail Entertainment and Dining
| Others |
| RED | Retail Environment Design
| Others |
| red | reverse electrodialysis
| Others |
| RED | Revolution Education And Development
| Others |
| RED | Ride Educate Discover
| Others |
| RED | Rnasel Enzyme Dysfunction
| Others |
| RED | Road Edge Detection
| Others |
| RED | Roll, Eyes in, Dark
| Others |
| RED | Romantic Eccentric Dress
| Others |
| RED | Rosa Enterprise Desktop
| Others |
| RED | Rural Economic Development (program) (Ontario)
| Others |