| RAI | Academy of Engineering of Spain 
| Others |
| RAI | Los Angeles Raiders
| Others |
| RAI | Praia International Airport, Praia, Cape Verde Islands
| Others |
| RAI | Radar Altimeter Indicator
| Others |
| RAI | Radio Audizioni Italia
| Others |
| RAI | Radio Audizioni Italiane
| Others |
| RAI | Radiotelevisione Italiana
| Others |
| RAI | Ram Air Intake
| Others |
| RAI | Rapid Acquisition Indication
| Others |
| RAI | Rapid Application Integration
| Others |
| RAI | Reaching Arms International
| Others |
| RAI | Recapitalization Advisors, Incorporated
| Others |
| RAI | Redundant Array of Inexpensive
| Others |
| RAI | Reference Author Index
| Others |
| RAI | Regent Admission Index
| Others |
| RAI | Reglaje Automatico Integrado
| Others |
| RAI | Reliability Assurance Initiative
| Others |
| RAI | Remote Alarm Indication
| Others |
| RAI | Remote Assistance Initiation
| Others |
| RAI | Resident Assessment Instrument
| Others |
| RAI | Resident Assessment Instruments
| Others |
| RAI | Resource Adapters, Incorporated
| Others |
| RAI | Resource Availability Indication
| Others |
| RAI | Resources Activities and Items
| Others |
| RAI | Responsible agricultural investments
| Others |
| RAI | Restaurants Association of Ireland
| Others |
| RAI | Retailers Association of India
| Others |
| RAI | Reynolds American Incorporated
| Others |
| RAI | Reynolds American International
| Others |
| RAI | Rijwiel and Automobiel Industrie
| Others |
| RAI | Rijwiel Automobiel Industries
| Others |
| RAI | Rijwiel en Automobiel Industrie
| Others |
| RAI | Road Asset Improvement
| Others |
| RAI | Roberts Ackley Improved
| Others |
| RAI | Robotic Agent Interface
| Others |
| RAI | Roll Attitude Indicator
| Others |
| RAI | Rotary Authorized Installers
| Others |
| RAI | Rothermere American Institute
| Others |
| RAI | Routing Area Identity
| Others |
| RAI | Royal Anthropological Institue
| Others |
| RAI | Royal Anthropological Institute
| Others |
| RAI | Royal Anthropological Institute of Great Britain and Ireland
| Others |
| RAI | Royal Archaeological Institute
| Others |
| RAI | Royalty Administration International
| Others |
| RAI | RSS Abstraction Interface
| Others |
| RAI | Rudder Angle Indicator
| Others |
| RAI | Runway Alignment Indicator
| Others |
| RAI | Rural Access Indicator
| Others |