RFB or RfB may refer to:

• Radio Free Brooklyn, a community freeform Internet radio station in Brooklyn, NY
• "Radio Free Burrito", a podcast by Wil Wheaton
• Rain-free base, a portion of a thunderstorm cloud-base associated with the updraft that is (completely or relatively) devoid of precipitation
• Really Free Band, a British Christian rock band
• Reichenbachfall Funicular, in the Swiss canton of Berne
• RFB protocol, a simple "remote framebuffer" protocol for remote access to graphical user interfaces
• Rhein-Flugzeugbau, a German aircraft company
• "Room, Food, and Beverage", see Comps (casino)
• Roter Frontkämpferbund ("Red Front Fighters' League"), a paramilitary organization of the Communist Party of Germany during the Weimar Republic
• Kel-Tec RFB, a gas-operated semi-automatic rifle
• República Federativa do Brasil

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