Jack C. Voight (born December 17, 1945) is an American politician and businessman who served as the 32nd State Treasurer of Wisconsin from 1995 to 2007.

Born and raised in New London, Wisconsin, Voight received his Bachelor of Science degree from the University of Wisconsin–Oshkosh in 1971.

After serving as a sergeant in the United States Army from 1968 to 1970, he moved to Appleton, Wisconsin, where he established an insurance agency.

On April 5, 2011, he was defeated by former Assemblyman and unsuccessful Democratic nominee for Lieutenant Governor Tom Nelson, by roughly 52% - 48%.

Voight blamed the political unrest stemming from Governor Scott Walker's policy drive to eliminate public workers' collective bargaining powers, saying "The labor movement has not only energized the Democratic Party base but a lot of the independents.