The site, encompassing over 120 acres of woodland, lakes, wildflower meadows, vistas, glades and ponds, first opened to the public in 1999 as the Castle Howard Arboretum.
Chair of the trustees Professor Alastair Fitter said: "Our new name, the Yorkshire Arboretum, is part of our plans to make many more people aware of this glorious place, one of Yorkshire’s best-kept secrets.
"In turn, this will enable us to continue the important conservation and education work undertaken here. The name reflects our location and values as a place of inspiration and education for Yorkshire and beyond".
Director of the arboretum Dr John Grimshaw added "We are planning significant investments in the arboretum and its facilities over the next three years, which will enable us to make this beautiful place even more attractive for our visitors".