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: ), governs rugby union in France 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 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