The 1918 Wisconsin Supreme Court special election was a special election held on Tuesday, April 2, 1918, to elect a justice to the Wisconsin Supreme Court. Incumbent justice Marvin B. Rosenberry (who had been appointed to in 1916 to fill a vacancy) won re-election over Charles H. Crownhart (the former chairman of the Wisconsin Industrial Commission).
The election coincided with a special U.S. Senate election in the state, which garnered much greater public interest that the court election.
| colspan="6" style="text-align:center;background-color: #e9e9e9;"| General Election (April 2, 1918)