The funeral of Baroness Thatcher will take place on Wednesday, 17 April, Downing Street has announced.
The 87-year-old former prime minister died on Monday, after suffering a series of strokes.
The funeral ceremony, with full military honours, will take place at London's St Paul's Cathedral, following a procession from Westminster.
The Queen, accompanied by the Duke of Edinburgh, will attend the service, Buckingham Palace said.
Lady Thatcher will not have a state funeral but will be accorded the same status as Princess Diana and the Queen Mother.
A ceremonial funeral is one rung down from a state funeral - normally reserved for monarchs - and requires the consent of the Queen.
A Downing Street spokesman said the details had been agreed at a "co-ordination meeting" between the Thatcher family and Buckingham Palace on Tuesday morning.