1958 Wisconsin Supreme Court election

The 1958 Wisconsin Supreme Court election was held on Tuesday, April 1, 1958, to elect a justice to the Wisconsin Supreme Court for a ten-year term. William H. Dieterich defeated incumbent justice Emmert L. Wingert (who had been appointed after the death on the bench of Edward J. Gehl) by a comfortable margin. The election result was considered to be a seismic upset. Wisconsin voters had rarely previously unseated incumbent Supreme Court justices. Dieterich was a perennial candidate for the state supreme court and state attorney general who usually lost by sizable margins (having only two years earlier been defeated in a general election for another supreme court seat by a margin of more than 4–1). Before the election there were few signs that Dieterich stood any chance of winning, let alone winning a 4.8 percent margin and with a lead in 46 of the state's 71 counties.