Belfast City Council is the first local authority in the north to set up a Brexit Committee.
Membership of the new committee was confirmed at a council meeting earlier this week.
Expected to hold its first meeting in August, the new committee will be responsible for "researching, monitoring and reviewing the financial, resource or operational impact" of Brexit on Belfast.
The new committee will be chaired by Sinn Féin's Séanna Walsh, with the DUP's Guy Spence acting as deputy chairman.
The chairman will receive allowances of £6,150 while the deputy chairman will get £3,000.
Places on the 20-member committee have been allocated using the D'Hondt method.
Mr Walsh defended the creation of the committee saying it was "an entirely sensible approach for any local authority to take when confronted with something as momentous as Brexit".
"The DUP and other unionist parties need to start working in the interests of the people of Belfast and not against them when it comes to Brexit," he told the BBC.
A DUP spokesperson added: "Sinn Féin proposed this committee years into the process of leaving the EU, so why now it must be asked?
“It will hardly have met before the negotiations reach a conclusion in October.”
