Here's a short list of famous people who have ties to Wisconsin:
Arnold Schwarzenegger
Business degree from UW-Madison or UW-Superior
Charlotte Rae (submitted by RachelP)
Actress in Diff'rent Strokes and The Facts of Life
Born in Milwaukee, WI and graduated from Shorewood High School.
Chris Farley (submitted by Kyletall)
Born in Madison, WI and attended University of Marquette.
Frank Caliendo
From Waukesha, WI
I actually attended UW-Milwaukee with Frank and was friends with him before he became famous. He used to practice his impressions while we ate lunch. His best impressions at that time were Christopher Lloyd and Robin Williams.
Fred MacMurray (Actor) (submitted by John B)
Attended Carroll College
Gary Burghoff (Actor) (submitted by John B)
Attended high school in Delevan, WI
Harrison Ford
Attended Ripon College
Harry Houdini
Lived part of his childhood in Appleton, WI.
Harry Selfridge (submitted by Kyletall)
Harry Selfridge who founded Selfridges in London, was born in Ripon, Wisconsin. Selfridge's department store was twice voted the best department store in the world and the TV show Masterpiece on PBS produced a series entitled Mr. Selfridge starring Jeremy Piven as Harry Selfridge
Jane Kasmerick (Actress)
Born in Milwaukee, WI
Jill Eikenberry (submitted by DiAnna)
Jill was a cast member of LA Law and was raised in Madison, WI. https://www.imdb.com/name/nm0251708/bio
Joan Cusack
Attended UW-Madison
Les Paul (Musician) - (submitted by John Berg)
Born in Waukesha, WI
Liberace (submitted by Kyletall)
Michael Moore
Attended UW-Madison
Orson Welles
Rachel Brosnahan (submitted by Kyletall)
Famous for The Marvelous Mrs. Maisel.
Born in Milwaukee, WI
Ringling brothers (submitted by Kyletall)
Spencer Tracy (submitted by Kyletall)
Tony Shalhoub (submitted by Kyletall)
Famous for TV show Monk
Willem Dafoe (submitted by Josh K)
Born in Appleton, WI and attended UW-Milwaukee for short time.