FFR may refer to: Medicine 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 Military 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 Music 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 Sports French Rugby Federation (French: ) French Rugby League Federation (French: ) Russian Fencing Federation FC Fazisi Racha, a Georgian association football club Transportation Factory Five Racing, an American automobile kit company Franconian Forest Railway, in Bavaria, Germany Fischer Air, a defunct Czech airline Other Federal funds rate, in the United States Filtering face respirator, a particulate-filtering respirator worn on the face, such an N95 Firearm–related Fatality Rate, measure in the epidemiology of firearm–related fatalities Five Finger Rapids, Yukon River, Yukon, 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 journalistswho work on military and humanitarian frontlines Final Form Ride Series, a toy line of Kamen Rider Decade action figures