Prince Harry and Meghan Markle will walk down the aisle next May at St George's Chapel, Windsor Castle.
Kensington Palace has said the Royal family will pay for the wedding, which will include the church service, the music, the flowers and the reception.
The Royal Family have congratulated the happy couple since the news of their engagement was released on Monday.
The protestant actress will also be both baptised and confirmed ahead of the wedding.
The bride-to-be will also become a United Kingdom citizen but the process could take a number of years.
Jason Knauf, Prince Harry's communication's secretary, said Windsor is a "very special place" for Harry and that the couple had spent time there during their 16-month romance. We now have a date (May 2018) and a location (St. George's Chapel).
Meghan Markle and Prince Harry
He said they were delighted to be holding the wedding in the "beautiful grounds of Windsor".
Meghan also said she intends to become a British citizen.
St. George's Chapel at Windsor Castle.
Mr Knauf said the couple, who were grateful for the warm wishes from the public, would be putting their stamp on their wedding day.
"They will be making sure it reflects who they are as a couple", he said.
Based on Meghan's Instagram photos, the trio were in Spain in August, which means they could have easily been in London in July, when Prince Harry and Meghan met. Her future sister-in-law, Kate Middleton, had already been baptized into the church before getting engaged to Prince William, but she was confirmed weeks prior to her wedding in April 2011.More news: Ben Stokes: England all-rounder in talks with NZ side Canterbury