Belfast City Council has said that a portrait of President Michael D Higgins has been safely stored at City Hall while the newly-elected lord mayor "considers options" for the space.
The portrait's removal from the mayor's parlour was raised by Sinn Féin at a council meeting last night.
In June, Cllr Tracy Kelly became Belfast City's first female lord mayor from the Democratic Unionist Party (DUP).
Last year, while serving as mayor, Cllr Ryan Murphy of Sinn Féin unveiled the portrait of President Higgins, which was displayed in the parlour alongside an image of Britain's King Charles.
Cllr Murphy has called for an explanation as to where the artwork has gone.
He said: "The Mayor of Belfast has a responsibility to promote respect and tolerance for all traditions in our city.
"A large section of the community in Belfast have a deep respect for Uachtarán na hÉireann and that was reflected in the presence of the portrait in City Hall.
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"It was put up alongside the royal portrait of the British King Charles and marked with a small event.
"There is no rationale behind the removal of this portrait. What message does it send out to people in this city who hold the President of Ireland in high regard?
"Sinn Féin wants to work with all parties to build a city based on equality and ensure Belfast City Hall is reflective of all its citizens," Mr Murphy added.
Asked about the portrait's removal, a DUP spokesperson said: "Decoration of the Lord Mayor's parlour is not yet complete. There will be be further artefacts to be added in the next few weeks".
Meanwhile, a spokesperson for Belfast City Council said the decoration of the parlour is a matter for each individual lord mayor throughout their term in office.
"The photographic portrait of President Michael D Higgins has been safely stored at City Hall, at the request of the current Lord Mayor, while she considers options for this space during her mayoral term," they added.
The lord mayor's parlour is a formal room on the first floor of Belfast City Hall that is used for meetings, receptions and special occasions.
