William J. Gantter (June 15, 1885 – February 25, 1942) was a member of the Wisconsin State Assembly.
Gantter was born on June 15, 1885, in Kaukauna, Wisconsin.[1] During World War I, he served in the United States Army.[2] In 1937, Gantter was Police Commissioner and Fire Commissioner of Kaukauna.
Gantter was a member of the Assembly from 1939 to 1940. He was a Republican. Afterward, he became the mayor of Kaukana. His term as mayor was cut short by his death, on February 25, 1942.[3]