| RAS | Royal Astronomical Society | - | Atmospheric Research Center |
| RAS | Reflectance Anisotropy Spectroscopy | - | Computer Acronyms(common) |
| RAS | Reflection-absorption Spectroscopy | - | Computer Acronyms(common) |
| RAS | Renin-angiotensin System | - | Computer Acronyms(common) |
| RAS | Restricted Active Space (wave Function) | - | Computer Acronyms(common) |
| RAS | Returned Activated Sludge | - | Computer Acronyms(common) |
| RAS | Routine Analytical Services | - | Computer Acronyms(common) |
| RAS | Remote Access Services | - | Human Genome |
| RAS | Requirements Allocation Sheet | - | Organizations |
| RAS | Retrospective Analysis System | - | Business and Finance |
| RAS | Royal Astronomical Society | - | Business and Finance |
