The star, who launched his career with Wham in the 1980s and later continued his success as a solo performer, is said to have “passed away peacefully at home”. Thames Valley Police said South Central Ambulance Service attended a property in Goring in Oxfordshire at 13:42 GMT.
Police say there were no suspicious circumstances.
Michael, who was born Georgios Kyriacos Panayiotou in north London, sold more than 100m albums throughout a career spanning almost four decades.