Sarah Mullally will take over from Richard Chartres who previously held the role of Dean of Her Majesty's Chapels Royal.
Alongside her current diocesan roles, Bishop Sarah will officiate at major church services attended by the royal family and will likely take part in events such as weddings and christenings.
The role of dean is normally held by the Bishop of London but Lord Chartres held onto the role after his retirement in 2017.
After serving in the role since 1995, he'll step down after his 72nd birthday in July.
Speaking about her appointment, Bishop Sarah said: "It is an honour and a privilege to be appointed as Dean of the Chapels Royal. The role is one of great historical significance, playing an important role to this day, supporting Her Majesty and the Royal Family."
Lord Chartres said: "It has been a privilege to serve the Queen as Dean. I have hugely enjoyed the partnership with other members of the Royal Household and the superlative team in Her Majesty's Chapels Royal."
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