A total of £26m was spent by the PSNI, policing parades and parades-related protests in Northern Ireland during the six-month period of April to October this year.
An Alliance party member of the policing board, Chris Lyttle, sought the information and described the cost as shocking and unsustainable.
Parading is one of the issues under consideration in political negotiations involving the five main parties at Stormont.
US diplomat Dr Richard Haass is currently preparing a second draft of proposals on three issues - parades, flags and how to deal with the past.
He has set an end of December deadline for the negotiations.
