Mark Gundrum (born March 20, 1970) is an American politician from the state of Wisconsin. He has served as a legislator and jurist.
Born in Milwaukee, Wisconsin, Gundrum graduated from Waukesha Catholic Memorial High School, where he played for the school's gridiron football team. He received his bachelor's and law degrees from the University of Wisconsin–Madison. Gundrum served on the Hales Corners, Wisconsin village board. He later worked as a staff attorney for Rudolph T. Randa, a judge for the United States District Court for the Eastern District of Wisconsin. He joined the United States Army Reserve in 2000, and was deployed to Iraq in 2008.
In 1998, Gundrum won the race to succeed Mary Lazich in the Wisconsin State Assembly as a Republican. In the 2002 election, he defeated fellow state legislator Marc C. Duff, who ran against Gundrum due to redistricting. While serving in the Wisconsin State Assembly, Gundrum worked with Steven Avery, who was exonerated after being falsely convicted of a sexual assault, to pass a criminal justice reform bill. In 2010, Gundrum was appointed Circuit Court judge for Waukesha County and then was appointed in 2011 to the Wisconsin Court of Appeals.
Gundrum and his wife, Mary, married in 1996. They are Catholic and have eight children, who they homeschooled through Wisconsin Virtual Academy. Their youngest child was born with encephalocele and a facial cleft, which required surgery to correct at Boston Children's Hospital. Gundrum appeared in the 2015 Netflix documentary series Making a Murderer, detailing Avery's case.
Gundrum was named as one of Governor Scott Walker's finalists to replace Justice David Prosser, Jr. on the Wisconsin Supreme Court in June 2016.