| RA | Right Ascension | - | Atmospheric Research Center |
| RA | Revenue Account | - | Chatting Acronyms |
| RA | Reduced Aggregate (interplanetary Dust Particle) | - | Computer Acronyms(common) |
| RA | Remedial Action | - | Computer Acronyms(common) |
| RA | Rheumatoid Arthritis | - | Medical(slang) |
| RA | Rheumatoid Arthritis | - | Medical(slang) |
| RA | Radar Altimeter | - | Organizations |
| RA | Radar Altimeter (R/A Preferred) | - | Organizations |
| RA | Radium | - | Organizations |
| RA | Range Area | - | Organizations |
| RA | Right Aft | - | Organizations |
| RA | Right Ascension | - | Organizations |
| RA | Radium | - | Astronomy |
| RA | Rain (METAR Code) -Rear Area - Reinforced Alert - Republican Army - Right Ascension - Royal Artillery (UK) - Royal Academy | - | Astronomy |
| RA | Radio Antenna | - | Business and Finance |
| RA | Radio Active | - | Business and Finance |
| RA | Registration Authority
| - | Human Genome |
