The stunning bride wore a long-sleeved dress with a pretty lace veil, while her handsome groom looked traditional in a three piece suit.
A Benedictine monk - father Chad Boulton - will be officiating the ceremony. Clarke plays Daenerys Targaryen on the hit fantasy show, while Dinklage plays Tyrion Lannister and Turner plays Sansa Stark.
The castle also features eight bedrooms, and the expectation is that Harington and Leslie will spend their wedding night in the room known as Laird's Bedroom.
It stated: "Christopher Catesby Harington is to marry Rose Eleanor Arbuthnot Leslie on Saturday June 23".
The actors, who are both 31, have been dating for several years but have kept their relationship fairly low key.
The power couple, who announced their engagement in September a year ago, Wednesday at a church on the grounds of Rose's family's estate.
Entry number 317/2018/42 of the Huntly Register marriage notice book reads that Christopher (Kit) Catesby Harrington is to marry Rose Eleanor Arbuthnot Leslie on Saturday.
Leslie left the show in 2014, but Harington's iconic character has appeared in every episode.
As expected, Harington and Leslie also welcomed their Game of Thrones castmates to the event.
"If you're already attracted to someone, and then they play your love interest in the show, it's becomes very easy to fall in love...".
"Because the country is attractive, because the Northern Lights are magical, and because it was there that I fell in love", he recalled. I meant to do it the day after with the lights.
Traditionally, the weddings on Game of Thrones have been bloody affairs filled with stabbings, poisonings, and betrayal. "I popped my question a bit early", he said on Britain's "The Jonathan Ross Show".