The pair beat Jamie's Brit rival Heather Watson, 25, and her Finnish partner Henri Kontinen, 27, in straight sets, blazing to a 6-4, 6-4 win.
Doubles star Jamie Murray stormed to victory on Centre Court with partner Martina Hingis in just one hour and 11 minutes.
The duo only chose to strike up a partnership in the days leading up to The Championships, but breezed through the draw without dropping a single set, overcoming defending champions Heather Watson and Henri Kontinen 6-4 6-4 in the final on Centre Court.
Roger Federer will surely dominate the Wimbledon headlines Sunday as he chases an Open Era men's record eighth singles title but it should not be forgotten that after the main course, there's also dessert to enjoy, in the form of the mixed doubles final.
Murray, who won his first title at Wimbledon ten years ago, said: 'I forgot what it felt like the last time I won.
It is Murray's second mixed doubles title, following his win with Jelena Jankovic back in 2007.
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The top three drivers were all from Team Penske with championship leader Scott Dixon of New Zealand, third in 1: 00.6253. "If it's got four wheels and an engine, I'll give it a whirl", Hinchcliffe told The Canadian Press.
Hingis, who has won five Grand Slam singles titles, 11 women's doubles and six mixed doubles, usually gets her way.
Murray and Hingis will start the final as favourites but there will be at least one set of British hands on the trophy come Sunday evening no matter what, a prospect Watson says she is relishing.
Watson said: "I think that I missed a few too many returns today".
Murray said: "It's a great achievement".
A stinging Hingis return set up two break points, and she and Murray converted the second when Watson chipped a short ball into the net. In the first set, as both men held easily, the key battles were fought on the Watson and Hingis serve. I mean, she's won everything, won so many mixed as well.
They had to work for the title - saving three break points as they looked to serve it out, before Murray finished it off on his serve. 'A odd feeling today, we haven't felt it yet together. It was just a great opportunity for me to play and to really feel like you could do good things on the court and have a great shot to win.
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