Giles Cooper of Heritage Live Festivals, said: "We're absolutely thrilled to bring one of the greatest pop artists of all time to the Royal Sandringham Estate for an exclusive UK headline show.
"Mariah's live show is second to none and with such a catalogue of huge hit singles, it's going to be an incredible occasion.
It will be the second UK show for the singer this summer, as she has also been confirmed as the headliner for the Brighton Pride Festival on 2 August.
The US megastar is lined up to headline Heritage Live at Sandringham in Norfolk on 15 August.
Carey has 19 number one US singles to her name, more than any other solo artist in the history of the Billboard Hot 100 chart.
