Robert James Berry (11 June 1916 – 2 August 2018) was a New Zealand dendrologist who founded Hackfalls Arboretum at his farm in Tiniroto, Gisborne. The arboretum is now known for having one of the largest collections of Mexican oaks in the world. During the 1950s and 1960s he was in regular contact with William Douglas Cook, the founder of Eastwoodhill Arboretum, Ngatapa, Gisborne. Berry made the first catalogues of this arboretum, which is now the National Arboretum of New Zealand.