Wayne Rooney only picked up 10 points from his 15 matches in charge of Birmingham City
The 38-year-old was appointed on 11 October following the controversial decision to dismiss John Eustace, with Blues sixth in the table.
Since then they have slipped to 20th, Monday's 3-0 loss at Leeds having been the ninth defeat of his 15-game tenure.
"Football is a results business and I recognise they've not been at the level I wanted them to be," Rooney said.
Professional development coach Steve Spooner will take interim charge for Birmingham, who have also parted company with one of Rooney's backroom team, former Wolves and Wales midfielder Carl Robinson.
-- Courtesy of BBC Sport