| RPI | Railway Progress Institute 
| Others |
| RPI | Random Party Implosion
| Others |
| RPI | Rapid Process Improvement
| Others |
| RPI | Raspberry PI I
| Others |
| RPI | Rating Percentage Index
| Others |
| RPI | Ratings Percentage Index
| Others |
| RPI | Ratings Performance Index
| Others |
| RPI | Ratings Power Index
| Others |
| RPI | Real Property Information
| Others |
| RPI | Real Property Inventory
| Others |
| RPI | Really Poor Index
| Others |
| RPI | Rebounds Per Inning
| Others |
| RPI | Reciprocal Ponderal Index
| Others |
| RPI | Recognition Professionals International
| Others |
| RPI | Recruiting Publicity Item
| Others |
| RPI | Recursive Program Interface
| Others |
| RPI | Region of Probable Injury
| Others |
| RPI | Registered Provisional Immigrant
| Others |
| RPI | Render Performance Index
| Others |
| RPI | Renewable Properties Inc
| Others |
| RPI | Rensselaer Polytechnic Institute
| Others |
| RPI | Republican Initiative
| Others |
| RPI | Request Progression Interface
| Others |
| RPI | Requested Packet Interval
| Others |
| RPI | Research and Policy Institute
| Others |
| RPI | Resort Parks International
| Others |
| RPI | Retail Price Index
| Others |
| RPI | Retail Prices Index
| Others |
| RPI | Retarded People's Institute
| Others |
| RPI | Reticulocyte Production Index
| Others |
| RPI | Retinitis Pigmentosa International
| Others |
| RPI | Reverse Puiseux Inequalities
| Others |
| RPI | Rick Pitino Inflated
| Others |
| RPI | Rockwell Proprietary Interface
| Others |
| RPI | Rockwell Protocol Interface
| Others |
| RPI | Role Playing Intensive
| Others |
| RPI | Roofing Products International
| Others |
| RPI | Rotary Precision Instruments UK, LTD.
| Others |
| RPI | Rowdy Puz Institution
| Others |
| RPI | Rural Property Investments
| Others |
| RPI | Rutgers Pitiful Injustice
| Others |