Hermann Becker-Freyseng (18 July 1910 – 27 August 1961) was a German physician, consultant for aviation medicine with the Luftwaffe and a convicted Nazi war criminal, who oversaw human experimentation on concentration camp prisoners.

Becker-Freyseng graduated as a physician from the University of Berlin in 1935 although his first notable research involvement did not come along until three years later when he worked with Hans-Georg Clamman on experiments on the effects of pure oxygen.

[6] In particular, the high altitude experiments performed on inmates of Dachau concentration camp by Becker-Freyseng, Siegfried Ruff and Hans-Wolfgang Romberg claimed a number of lives.

For the experiments, the academics had personally asked Heinrich Himmler for 40 healthy camp inmates who were then forced to drink salt water or in some cases had it injected into their veins.

[11] Given responsibility for collecting and publishing the research undertaken by him and his colleagues, the resulting book, German Aviation Medicine: World War II, appeared just after Becker-Freyseng began his prison sentence.