The bride wore a long sleeve ivory lace wedding dress, a white flower crown and cathedral veil and carried a bouquet of white roses.
Although specific plans about the wedding have not been made public, they could Wednesday at Wardhill Castle, which is owned by the Leslie family.
Guests including fellow Game of Thrones star Sophie Turner - who herself is engaged to Joe Jonas - as well as Maisie Williams and Peter Dinklage.
The 23 June date was posted at the Huntly registration office last month.
Fans of the show gathered outside the castle hoping to catch a glimpse of the couple. It's a great day for Aberdeenshire.
The actors met in 2012 while filming the long-running saga in Iceland, where they were playing Jon Snow and Ygritte.
Harington and Leslie met on the show in 2012.
They announced their engagement in the Times newspaper a year ago and are expected to marry at Wardhill Castle in Aberdeenshire. Former "Game of Thrones" co-stars Kit Harington and Rose Leslie are marrying Saturday with a celebration at the bride's family castle in Scotland. "It's a lovely thing", she told ET in 2016.
Harington and Leslie are seen here at the premiere of HBO's Game Of Thrones season 7 in 2017 in Los Angeles.
"The country is handsome... the northern lights are magical... it was there that I fell in love", he said.
"I was going to string up some lights in some trees and do all the romantic stuff", he revealed. "What I meant to say was, I popped my question a bit early".
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