Moritz Schiff (28 January 1823, Frankfurt am Main – 6 October 1896, Geneva) was a German physiologist.
While working in Bern, he showed that removing the thyroid gland from dogs was fatal, and later showed that animal thyroid extract could prevent the death.
Subsequently he successfully used thyroid extract to treat humans.
He made other major contributions to human physiology, including studies of the circulatory system and the action of the vagus nerve.