Staush Gruszynski is an American politician who serves in the Wisconsin State Assembly, representing the 90th Assembly District. He is a member of the Democratic Party.
Gruszynski has served on the Brown County Board of Supervisors since 2014, and won an unopposed election in 2018 to take over the seat of State Representative Eric Genrich, who was seeking to run for mayor of Green Bay.
Born in Marinette, Wisconsin, Gruszynski is the nephew of Stan Gruszynski, a former Wisconsin State Representative from the Plover area. According to his campaign website, Gruszynski spent summers working for his father's construction business and volunteering for his uncle's campaigns, which he notes sparked his early interest in politics.
Gruszynski is involved in conservation efforts, serving as the president of Green Bay's chapter of conservation group Trout Unlimited, as well as the political director for the Wisconsin League of Conservation Voters.
Gruszynski attended the University of Wisconsin–Oshkosh, and received a degree in political science and public administration in 2008.
In December 2019, the Wisconsin Legislative Human Resources Office substantiated a complaint that Gruszynski sexually harassed a legislative staffer at a bar. Democratic party leaders called on Gruszynski to resign and stripped him of his committee assignments.