John Jacob Lentz (January 27, 1856 – July 27, 1931) was an American lawyer and politician who served as a U.S. Representative from Ohio for two terms from 1897 to 1901.

He graduated from the University of Michigan at Ann Arbor in 1882 and from Columbia Law School, New York City, in 1883.

[1] He was the founder of the American Insurance Union in 1894 and was its president continuously from then until his death.

Lentz was a member of the Board of Governors of the Loyal Order of Moose.

This article incorporates public domain material from the Biographical Directory of the United States Congress