Firefighters were alerted by a lifeline system at the property in Aspley Road in Sutton in Ashfield shortly after 19:00 GMT on Monday.
They went to the flat and found the man unresponsive in a room that was filled with smoke.
He was pronounced dead at the scene, the fire service said, but the cause of the blaze was yet to be established.
A joint investigation between Nottinghamshire Police and the fire service has been started.
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