Martin Kissinger Gantz (born January 28, 1862) was a Democratic politician who represented Ohio in the United States House of Representatives. Serving as a member of Congress from Ohio’s 4th congressional district, he held office during the Fifty-second Congress, reflecting the Democratic Party’s presence in that region at the close of the 19th century.

Gantz’s term in the U.S. House began on December 7, 1891, and concluded on March 3, 1893, marking a single term in federal office. As a Representative from Ohio, he participated in national legislative affairs during this period, though specific committee assignments or legislative initiatives are not recorded in the available metadata. After his service ended in 1893, he did not return to Congress, and he is regarded as a former member of the House.