RF is an abbreviation for radio frequency.
Rf or RF may also mean:
Arts and entertainment
- Red Faction (series), a series of revolution video games
- Rinforzando, rf, in music notation
- RF Online, an online RPG made by CCR
Business
- Aero K, IATA code (2020—present)
- Florida West International Airways, IATA code (1984—2017)
- Regions Financial Corporation, NYSE stock symbol
- Registered association (Finland) (Registrerad förening), Finnish legal status for a non-profit organization
- Royalty-free, in business
Government and politics
- France (République française)
- Russian Federation
- Rhodesian Front, former political party in Rhodesia
Biology and medicine
- Rheumatic fever, an inflammatory disease
- Release factors RF1, RF2, RF3, proteins
- Reticular formation, in the brainstem
- Rheumatoid factor, an antibody
- Receptive field, the response characteristic of a neuron
- Respiratory failure
- Risk factor
Other uses in science and technology
- Representative fraction
- Rest frame
- Retardation factor in a chromatographic system
- Radiative forcing, the change in energy flux in the atmosphere caused by climate change factors
- Random forest, an ensemble learning method in data science
- Rutherfordium, symbol Rf, a chemical element
- Canon RF mount, interchangeable camera lens mount
Sports
- Range Factor, a baseball statistic
- Right fielder, a defensive position in baseball
- Roger Federer, a Swiss tennis player
- Swedish Sports Confederation (Swedish: Riksidrottsförbundet, RF), the umbrella organisation for Swedish sports