John Janvier Black (November 6, 1837 - September 27, 1909) was an American surgeon and writer.

As a surgeon on his country rounds of thirty to forty miles he carried out successful operations with limited equipment.

[1] His dieting book Eating to Live was positively reviewed.

[3] The California State Journal of Medicine noted that "we have been well impressed with Dr. Black's work; physicians may read it with advantage to themselves and their patients.

He was a founding member of the Delaware Anti-Tuberculosis Society in 1907 and served as president.