In the Chicago mayoral election of 1889, Democrat DeWitt Clinton Cregier defeated incumbent Republican John A. Roche, winning a majority of the vote and a margin of victory in excess of ten percent.
The election was held on April 2, 1889.
Cregier was backed strongly by trade unions. John Peter Altgeld threw his backing behind Cregier's candidacy.
Creiger received 76.86% of the Polish-American vote, while Roche received 23.07%.