Robin Joseph Vos (born July 5, 1968) is an American businessman and Republican politician and the 79th speaker of the Wisconsin State Assembly, serving in that role since 2013. He has been a member of the Assembly since 2005, representing most of the southern half of Racine County. Vos was also president of the National Conference of State Legislatures.

Vos came to prominence for his role in shepherding legislation to weaken bargaining rights and labor unions in Wisconsin while Scott Walker was governor, which culminated in the failed 2012 Wisconsin gubernatorial recall election. Vos has been speaker of the Wisconsin State Assembly since 2013, retaining Republican control of the chamber through Republican-created maps. During the governorship of Tony Evers, a Democrat, Vos has sought to curb the governor's powers.

After Joe Biden won the 2020 election and Donald Trump refused to concede while making claims of fraud, Vos appropriated $680,000 in taxpayer money to fund an investigation by Michael Gableman into fraud in the 2020 election. Gableman's appointment came a day after Trump had accused Vos of participating in a coverup of the election. In March 2022, Gableman released a report rife with false claims of fraud and conspiracy theories. Vos fired Gableman in August 2022, three days after a primary election in which Gableman had endorsed Vos's challenger. At the time of his firing, Gableman's investigation had already cost Wisconsin taxpayers more than $1,000,000, but the costs continued to rise, climbing close to $2.5 million, as lawsuits related to the practices of his investigation continued more than six months later.

Vos was born in 1968, in Burlington, Wisconsin, in Racine County. He graduated from Burlington High School in 1986.

Vos attended the University of Wisconsin–Whitewater, where he studied political science and public relations. While at Whitewater, he roomed with Reince Priebus, who later became chairman of the Republican Party of Wisconsin, chairman of the Republican National Committee, and White House chief of staff. In 1989, Wisconsin governor Tommy Thompson appointed Vos as a student representative on the University of Wisconsin board of regents. Vos graduated in 1991.

After graduation, Vos worked as a legislative assistant to state representatives Jim Ladwig and Bonnie Ladwig. In 1994, Vos was elected to the Racine county board of supervisors. He remained on the board for the next 10 years. Also in 1994, Vos worked as district director for U.S. representative Mark Neumann of Wisconsin.

In 1996 Vos purchased the RoJos Popcorn Company in Burlington. In 2020, his popcorn business, Robin J. Vos Enterprises, received more than $150,000 in coronavirus relief from the Paycheck Protection Program.

Vos has an ownership stake of $4.8 million in rental properties in Whitewater, Wisconsin. In 2021, Vos led Republican efforts in the Wisconsin legislature to redirect COVID-19 relief payments so that they would go directly to landlords, such as himself, rather than renters.