Officer Michael Shields won the election with 54 percent of the vote. Four other candidates also ran for president, Shield said.
Shields, 33, is a trustee of the police officers' pension fund. In January, he voted for former Cmdr. Jon Burge to keep his pension.
Burge was sentenced to more than four years in prison for lying to federal authorities in connection with allegations that he tortured suspects. The state is now suing to try to stop Burge's pension.
Shields first made a name for himself with rank-and-file members in 2009 when -- as a pension fund trustee -- he questioned an earlier decision by the police pension board to commit $15 million to DV Urban Realty, a real-estate firm involving Robert Vanecko, a nephew of Mayor Daley, and Allison Davis, a mayoral supporter whose law firm once employed Barack Obama.
"This isn't the friends and family program of the mayor," Shields said in 2009.
Shields succeeds Fraternal Order of Police President Mark Donahue, who served three terms and was not eligible to run again.
(The Sun-Times Media Wire contributed to this report.)