Devyn Marble added 13 for the Hawkeyes, which picked up their biggest win of the season on the 20th anniversary of the death of former player Chris Street.
Iowa (13-5, 2-3 Big Ten) jumped ahead by 20 points late in the first half and held off a late charge by the Badgers (13-5, 4-1), which beat second-ranked Indiana 64-59 on Tuesday.
George Marshall had 20 points, all in the second half, but the Badgers became the last Big Ten team to lose a league game. Wisconsin fell a half of a game behind Michigan State in the standings with the loss.
