Marshal Admiral Osami Nagano (?? ??, Nagano Osami, June 15, 1880 – January 5, 1947) was a Japanese career naval officer and Admiral of the Fleet in the Imperial Japanese Navy from 1943.
He was more of an administrative officer than a sea commander.
From April 1941 to February 1944, he served as Chief of the Imperial Japanese Navy General Staff.
He was the founder of the Chiba Institute of Technology.
Nagano was arrested by the International Military Tribunal for the Far East but died of natural causes in prison during the trial.