| RRN | Race Reports Net 
| Others |
| RRN | Radar Rainfall Neural
| Others |
| RRN | Radio Radio Network
| Others |
| RRN | Radio Results Network
| Others |
| RRN | Rally Racing News
| Others |
| RRN | Rally Raid Network
| Others |
| RRN | Rapid Response Network
| Others |
| RRN | Read Right Now
| Others |
| RRN | Reality Radio Network
| Others |
| RRN | Receiver Registration Number
| Others |
| RRN | Reciprocal Research Network
| Others |
| RRN | Reconciliation Resource Network
| Others |
| RRN | Recovering Racists Network
| Others |
| RRN | Red River of the North
| Others |
| RRN | Refugee Research Network
| Others |
| RRN | Refugee Rights Network
| Others |
| RRN | Refund Reference Number
| Others |
| RRN | Regional Road Network
| Others |
| RRN | Registration Renewal Number
| Others |
| RRN | Relational Reasoning Network
| Others |
| RRN | Relationship Research News
| Others |
| RRN | Relative Record Number
| Others |
| RRN | Renewal Reference Number
| Others |
| RRN | Replacement renewal notice
| Others |
| RRN | Replication Requesting Node
| Others |
| RRN | Report Reference Number
| Others |
| RRN | Request Rejection Notification
| Others |
| RRN | Research Resource Network
| Others |
| RRN | Reseau Routier National
| Others |
| RRN | Resident Registration Number
| Others |
| RRN | Restraint Reduction Network
| Others |
| RRN | River Run Network
| Others |
| RRN | Robot Rebel Number
| Others |
| RRN | Rochester Regional Network
| Others |
| RRN | Rodeo Radio Network
| Others |
| RRN | Romulan Republic Navy
| Others |
| RRN | Route Reestablishment Notification
| Others |
| RRN | Routing Recording Number
| Others |
| RRN | Run River North
| Others |
| RRN | Rural Reconstruction Nepal
| Others |
| RRN | Rural Road Network
| Others |
| RRN | Serra Norte, PA, Brazil
| Others |