| Acronym | Definition |
|---|
| RFF | Resources For the Future |
| RFF | Reseau Ferre de France (French: Network Bottle Pincers of France) |
| RFF | Réseau Ferré de France |
| RFF | Recency Frequency Factor |
| RFF | Raster File Format |
| RFF | Register File Format |
| RFF | Repeat First Frame |
| RFF | Repeat First Field |
| RFF | Required Form Feed |
| RFF | Rede Ferroviaria Federal (Brazilian railway) |
| RFF | Relative Fundamental Frequency |
| RFF | Right Foot Forward (Tae Kwan Do) |
| RFF | Request For Forces |
| RFF | Rainbow Film Festival (UK) |
| RFF | Request for Flexibility (Fulton County Schools; Atlanta, GA) |
| RFF | Rescue and Fire Fighting |
| RFF | Rotterdam Film Festival (Rotterdam, Netherlands) |
| RFF | Raster File Format (graphics) |
| RFF | Real Friends Forever |
| RFF | Remote Fixed Facility (US Coast Guard) |
| RFF | Roger Federer Foundation |
| RFF | Request for Feedback |
| RFF | Refugee Film Festival (UNHCR) |
| RFF | Run-From-Flash (Cisco) |
| RFF | Ryukyu Freight Forwarder (shipping; Japan) |
| RFF | Reason for Failure |
| RFF | Request for Feature |
| RFF | Raised Face Flange |
| RFF | Redwall Fan Fiction |
| RFF | Request For Flight |
| RFF | Radio Frequency Finder |
| RFF | Ready For Ferry |
| RFF | Rescue Firefighter |