Michael J. Gableman (born September 18, 1966) is an American lawyer and former justice of the Wisconsin Supreme Court (2008–2018). A Republican, he has been described as a hard-line conservative.

From June 2021 until August 2022, Gableman was employed as a "special counsel" by Wisconsin Assembly speaker Robin Vos to investigate the results of the 2020 United States presidential election in Wisconsin. His fourteen-month investigation resulted in various unsubstantiated accusations against municipal clerks and members of the Wisconsin Elections Commission, and cost the state more than two million dollars. Gableman himself became a lightning rod for controversy and was the subject of several lawsuits and personal disputes with other officials; he was ultimately fired by Vos just three days after the August 2022 primary elections in Wisconsin. Vos later referred to Gableman as "an embarrassment to the state".

In a February 2024 settlement to one lawsuit, Assembly Republican leadership conceded that Gableman had violated state public records laws during his investigation. In April 2025, Gableman accepted a three-year suspension of his license to practice law to settle ongoing legal and ethical complaints stemming from his investigation and the subsequent litigation.

Michael J. Gableman was born in West Allis, Wisconsin, in 1966 and raised in Waukesha County. He is a graduate of New Berlin West High School (1984) and Ripon College (1988), where he earned a bachelor's degree in education and history. After college, Gableman taught American history at George Washington High School in the Milwaukee Public School system (1988–1989) before pursuing a legal career. He graduated from Hamline University School of Law in 1993.

While in law school, he worked as a part-time law clerk in the United States Attorney's office in Minneapolis. After graduating, he served as a law clerk at the state district court level in Douglas County, Minnesota, and the state circuit court level in Brown County, Wisconsin. He became a half-time assistant district attorney in Langlade County, Wisconsin, in 1996, and worked the other half time at a private law office while also serving as deputy corporation counsel for Forest County. Gableman then worked as an assistant district attorney in Marathon County.

In May 1999, governor Tommy Thompson appointed Gableman to the vacant post of district attorney of Ashland County. Gableman was elected to a full term in this office in 2002, but resigned shortly after his election to accept an appointment as an administrative law judge in the Wisconsin Department of Workforce Development.

Later that year, Gableman was appointed Wisconsin circuit court judge for Burnett County, by Governor Scott McCallum. He was elected to a full term in the April 2003 general election, receiving 78% of the vote over Burnett County district attorney Kenneth L. Kutz.

In Burnett County, Gableman established an inmate community service program, a juvenile community service program, a drug and alcohol court, and a restorative justice program for which he served as chairman of the board for six years. He also was an adjunct professor of law at Hamline University School of Law, teaching criminal procedure and professional responsibility.