St George's Chapel holds between 800 and 1000 people - large enough for a major wedding, but less formal that Westminster Abby where Harry's brother Prince William Wednesday Kate Middleton. or St Paul's Cathedral, where Harry's parents Prince Charles and Diana Spencer were married.
They are grateful to the Queen for granting permission for the use of the chapel.
The royal family would pay for all the core elements of the wedding including the service, flowers and music.More news: Amazon launches new tool aimed at people creating VR and AR apps
A spokesman said the 36-year-old Suits actress would retain USA citizenship through the process of becoming a United Kingdom citizen but it was "too early to say" if she would retain dual nationality.
The exact date of the wedding will be revealed at a later stage.
The Daily Telegraph said in an editorial: "A divorced, mixed-race Hollywood actress who attended a Roman Catholic school is to marry the son of the next king".
Just as fans might have hoped, Prince Harry and Meghan Markle's nuptials will be televised! We learned yesterday that Markle and Prince Harry's wedding will take place next spring, but Kensington Palace released a bulletin on Tuesday (November 28) offering more information.More news: PV Sindhu defeated in Hong Kong Super Series final
They will visit Nottingham, where Prince Harry started the Full Effect programme in 2014 through The Royal Foundation.
Mr Knauf said Harry and Ms Markle "want the public to feel part of their day" - and are looking at ways to achieve that.
Mr Knauf said the Duke and Duchess of Cambridge's children had met Ms Markle on many occasions. Harry's father Prince Charles, who is heir to the British throne, married Camilla in a low-key civil ceremony in 2005 because both bride and groom were divorced.More news: Nassar pleads guilty to sexual assault charges: "I'm so horribly sorry"