Commissioner Katarina Carroll and Queensland Police Union president Ian Leavers have been asked to front public hearings in Brisbane from October 5.
Ms Carroll admitted the force had issues with racism, sexism and misogyny at hearings in August, while Mr Leavers is yet to face the inquiry.
Judge Deborah Richards has ordered additional hearings after receiving hundreds of submissions about cultural issues within the force in response to Ms Carroll's evidence.
"More than 550 submissions have now been received by the commission, including more than 250 since the submission period re-opened (on September 5)," the inquiry said in a statement on Thursday.
When the commissioner appeared before the inquiry last month she admitted being appalled by vulgar public comments made by two senior police officers.
One was later promoted to chief superintendent after being disciplined over the misogynistic and offensive remark at a function in front of more than 100 of the state's top-ranking officers
The other officer tendered his resignation after his lewd comments were aired during the public inquiry into the state's sexist police culture.
The probe was due to wrap up on August 18 when Ms Carroll finished giving evidence. However, Judge Richards called for fresh submissions from police force members on cultural issues on September 5.
The inquiry's final report will now be delivered on November 14, five weeks later than planned.
The inquiry has heard from serving and retired police officers, domestic and family violence service providers, victim-survivors, as well as First Nations people since first sitting in July.
The inquiry was called in response to a recommendation by the Women's Safety and Justice Taskforce.
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