It comes as the prince faces a US civil case over claims he sexually assaulted a woman when she was 17.
The Duke of York's military titles and royal patronages have been returned to the Queen, Buckingham Palace has announced.
Prince Andrew, 61, will stop using the style His Royal Highness in an official capacity, a royal source said.
It comes as he faces a US civil action over sexual assault allegations - claims he has consistently denied.
A source close to him said he would "continue to defend himself" against the case brought by Virginia Giuffre