Jill Katherine Underly (born August 2, 1977) is an American educator and school system administrator from Iowa County, Wisconsin.

[2] In 2005, she moved to Madison, Wisconsin, where she continued her education at the University of Wisconsin–Madison and worked on the staff for Undergraduate Academic Services in the College of Letters & Sciences.

[4] Underly topped a field of seven candidates in the February 2021 nonpartisan primary,[5] and went on to defeat former Brown Deer superintendent Deborah Kerr in the April general election.

[6] Underly received the endorsements of retired Republican state senator Dale Schultz, Democratic U.S. senator Tammy Baldwin, U.S. representatives Ron Kind, Gwen Moore, and Mark Pocan, former Governor Jim Doyle, and nearly every Democrat in the Wisconsin Legislature.

[7][8] Her opponent, a proponent of voucher school expansion, was endorsed by former U.S. Secretary of Education Arne Duncan and Democratic state senator Lena Taylor.