The 1990 Wisconsin Supreme Court election was held on April 3, 1990, to elect a justice to the Wisconsin Supreme Court for a ten-year term. Incumbent justice Donald W. Steinmetz was re-elected over Richard S. Brown (a judge on the state Appeals Court).
The incumbent justice, Steinmetz, was a conservative member of the court. His opponent, Brown, received considerable support as a challenger, and was given an editorial board endorsement by the Milwaukee Journal. Following a contentious campaign, Steinmetz defended his seat to win re-election.
| colspan="6" style="text-align:center;background-color: #e9e9e9;"| General election (April 3, 1990)