Jirah Dewey Buck (20 November 1838 – 13 December 1916) was an American homeopath, naturopath, theosophist and writer.

[1] He was educated at Belvidere Academy, Hahnemann Medical College in Chicago and the Western Homeopathic College in Cleveland, Ohio where he graduated in 1864.

[1] He was professor of physiology and microscopy at Cleveland Homeopathic College in 1866–1871.

[2] In 1882, he was elected dean and professor of theory and practice of medicine.

Buck died in his home in Walnut Hills, Cincinnati after a long illness.