| ROS | Race Online Series 
| Others |
| ROS | Radical Oxygen Species
| Others |
| ROS | Rain Or Shine
| Others |
| ROS | Raster Output Scanner
| Others |
| ROS | Rate Of Oxidation
| Others |
| ROS | Rate Of Sulfation
| Others |
| ROS | Reactive Oxygen Species
| Others |
| ROS | Reactive Oxygen Stke
| Others |
| ROS | Read Only Storage
| Others |
| ROS | Read Optimized Store
| Others |
| ROS | Readout Server
| Others |
| ROS | Readout Subsystem
| Others |
| ROS | Realtime Operating System
| Others |
| ROS | Reconstitution Operational State
| Others |
| ROS | Record On Silicon
| Others |
| ROS | Recreation Opportunity Spectrum
| Others |
| ROS | Reduced Operating Status
| Others |
| ROS | Reduced Operational Status
| Others |
| ROS | Reed Organ Society
| Others |
| ROS | Registry Ordering and Supplement
| Others |
| ROS | Regulated Oxygen Supply
| Others |
| ROS | Regulated Oxygen System
| Others |
| ROS | Reliability and Operations Subcommittee
| Others |
| ROS | Remote Operating System
| Others |
| ROS | Remote Operation Services
| Others |
| ROS | Remote Operations Security
| Others |
| ROS | Remote Optimization Service
| Others |
| ROs | Remote Outputs
| Others |
| ROS | Removable Overhead Structure
| Others |
| ROS | Replica Optimization Service
| Others |
| ROS | Reports Online System
| Others |
| ROS | Research Output System
| Others |
| ROS | Resident Operating System
| Others |
| ROS | Resource Orchestration Service
| Others |
| ROS | Restriction Of Speed
| Others |
| ROS | Results Of Sin
| Others |
| ROS | Retail Outlet Shopping
| Others |
| ROS | Return of Old Symptom
| Others |
| ROS | Return of Old Symptoms
| Others |
| ROS | Return Of Saturn
| Others |
| ROS | Return On Sales
| Others |
| ROS | Return On Service
| Others |
| ROS | Revenue Online Service
| Others |
| ROS | Review of Symptoms
| Others |
| ROS | Review Of Systems
| Others |
| ROS | Riders Of the Storm
| Others |
| ROS | Right Of Speed
| Others |
| ROS | Rites of Spring
| Others |
| ROs | Roadworthiness Officers
| Others |
| ROS | Robot Open Standard
| Others |
| ROS | Robot Operating System
| Others |
| ROS | Robotic Operating System
| Others |
| ROS | Robotics Operating System
| Others |
| ROS | Rod Outer Segment
| Others |
| ROS | Roll Over Sensor
| Others |
| ROS | Roll Over Systems
| Others |
| ROS | Ron over Site
| Others |
| ROS | Rookie Online Series
| Others |
| ROS | Room Only to Stand
| Others |
| ROS | Rosario, Santa Fe, Argentina
| Others |
| ROS | Rose Of Sharon
| Others |
| ROS | Rosman, North Carolina, Spaceflight Tracking Data Network station
| Others |
| ROS | Route Of Synthesis
| Others |
| ROS | Rule Out Sepsis
| Others |
| ROS | Run Of Schedule
| Others |
| ROS | Run Of Site
| Others |
| ROS | Run Of Stack
| Others |
| ROS | Run On Schedule
| Others |
| ROS | Run On Server
| Others |
| ROS | Run On Site
| Others |