FFR

• Fellowship of the Faculty of Radiology of the Royal College of Surgeons in Ireland
• Fractional flow reserve, a technique used in coronary catheterization
• Frequency following response

• Falster Foot Regiment, a Royal Danish Army infantry regiment
• Frontier Force Regiment, of the Pakistani Army
• Fitted For Radio, British Army designators for vehicles equipped to carry radio equipment

• Fast Food Rockers, a British pop group
• Fit for Rivals, an American band
• For Future Reference, a 1981 album by the British synthpop band Dramatis
• Friendly Fire Recordings, an American record label

• French Rugby Federation (French: {{lang|fr|Fédération Française de Rugby}}), governs rugby union in France
• French Rugby League Federation (French: {{lang|fr|Fédération Française de Rugby à XIII}})
• Russian Fencing Federation
• FC Fazisi Racha, a Georgian association football club

• Factory Five Racing, an American automobile kit company
• Franconian Forest Railway, in Bavaria, Germany
• Fischer Air, a defunct Czech airline

• Federal funds rate, in the United States
• Filtering face respirator, a particulate-filtering respirator worn on the face, such as an N95
• Five Finger Rapids, Yukon River, Canada
• Flathead Forest Reserve, Montana
• Franciscan Friars of the Renewal, a religious institute in the Latin Church of the Catholic Church
• French First Republic
• Frontline Freelance Register, association of freelance journalists who work on military and humanitarian frontlines

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