John Edward Martin, Sr., (November 15, 1891 – December 9, 1968) was an American politician and jurist from Wisconsin.

[1] He enlisted in the U.S. Army in August 1917, and was commissioned a lieutenant after attending officer training at Fort Sheridan, Illinois.

During the war, he served alongside future Wisconsin Supreme Court justices Theodore G. Lewis, Edward J. Gehl, and Roland J.

In 1938, Martin was elected Wisconsin Attorney General, defeating incumbent Progressive Orland Steen Loomis.

[2] In June, 1948, he was appointed to the Wisconsin Supreme Court by Governor Oscar Rennebohm to fill the vacancy created by the death of Justice Chester A.