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, , 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 military 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 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 Swedish Sports Confederation (, RF), the umbrella organisation for Swedish sports