Donald Floyd Hagen (born January 2, 1938) was a vice admiral in the United States Navy.

Hagen was commissioned in 1951 as an ensign[1] and retired on June 29, 1995 as a vice admiral.

[2] Hagen studied at Concordia College and then received his medical degree from Northwestern University.

[4] Hagen was awarded the Bronze Star for his service as a combat surgeon.

[5] After his retirement from active service, Hagen served as executive vice chancellor and chief administrative officer of the University of Kansas Medical Center from September 1, 1995[2] to December 31, 2004.