The Royal Family will pay for the wedding, including the service, music, flowers and reception - the date will be announced later.
Ms Markle, 36, a Protestant, will be baptised into the Church of England and confirmed before the wedding.
A spokesman for the prince said the pair would make sure the wedding "reflects who they are as a couple".
Jason Knauf said Prince Harry, 33, and Ms Markle were "leading the planning process for all aspects of the wedding" and were working through ideas on how members of the public could "feel part of the celebrations".
"This wedding, like all weddings, will be a moment of fun and joy that will reflect the characters of the bride and groom," he added. read more