The deputy lord mayor of Sydney is the deputy head of the council of the City of Sydney, which is the local government area covering the central business district of Sydney in the State of New South Wales, Australia. Since 1949, the deputy lord mayor has been indirectly elected annually by the council, becoming a permanent council position following the passage of the Local Government (Areas) Act 1948. The holder may be appointed to a full mayoral term or for a shorter, specified duration. The deputy lord mayor assists the lord mayor in their work, exercising any function of the lord mayor at request and fulfilling the role during a casual vacancy of the lord mayor's office. The most recent election was held on 14 September 2024, following which the new council voted first-term councillor, Zann Maxwell, as deputy lord mayor.
The position of deputy lord mayor was made a permanent council position when the Local Government (Areas) Act 1948 placed the City of Sydney under the main body of local government legislation. Prior to 1 January 1949, "Deputy" Lord Mayors were occasionally elected to act for the council during times of absence or illness of a sitting Lord Mayor, but the position was not permanent under the Sydney Corporation Act 1932 or any previous acts. The following individuals have been elected as Deputy Lord Mayor of the City of Sydney: