Alessio di Capua was leading on Kew's fundraising efforts in the USA as executive director of Kew Foundation America in his most-recent role. At Eden, he will provide strategic leadership for high value, relationship-based fundraising.
Eden Project chief executive Gordon Seabright said: "This is a massively exciting appointment for the Eden Project.
"Alessio is an exceptional fundraiser whose talents and personality will see him become a valued member of the senior team here. He has an unrivalled track record at some highly prestigious organisations and his appointment will have a transformative effect on our fundraising efforts."
di Capua joined the charity sector 11 years ago following a career in banking and media. He has held senior fundraising positions at children's hospice charity Shooting Star Chase and the RHS before moving to Kew in 2013.
He said: "I am thrilled to be joining Eden Project. After a decade working for two British institutions deeply steeped in history, I am honoured to be leading the fundraising efforts of a young and inspirational charity with ambitious growth plans both in the UK and internationally."
He is also a member of the Development Committee at the Orange Tree Theatre in Richmond, London, and of the Advisory Board at Perfect Earth Project in East Hampton, New York.