The bride's father, Sebastian Leslie, said Saturday he was "absolutely thrilled" about the wedding.
They met in 2012 while shooting their hit TV show, paying on-screen lovers, Wildling Ygritte and Jon Snow.
Mr Leslie said it was also a day of celebration for the region, adding: "It's a great day for Aberdeenshire".
Numerous couple's "GoT" co-stars including Peter Dinklage, Sophie Turner, Emilia Clarke and Maisie Williams as well as pals including Malin Akerman and fiance Jack Donnelly, members of Mumford & Sons were reportedly on hand to celebrate.
"We would like to see him if possible", they said.
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Actor Peter Dinklage, who plays character Tyrion Lannister, blew a kiss at the crowd as he walked into the churchyard. Both Kit and Rose are 31 years old. "The engagement is announced between Kit, younger son of David and Deborah Harington of Worcestershire, and Rose, middle daughter of Sebastian and Candy Leslie of Aberdeenshire", the simple announcement read.
The couple's engagement was announced with a notice in the Times of London newspaper in September.
Harington and Leslie - who played Jon Snow and Ygritte respectively - were surrounded by guests including their Game of Thrones co-hosts.
Kit, also 31, said: "The country is handsome ... the Northern Lights are magical ... it was there that I fell in love". I was meant to do it the day after with the lights.
Meanwhile, Sophie Turner, who plays Sansa Stark in the show, wore an incredibly unusual ensemble to the elegant affair, as she attended alongside best friend Maisie Williams.