Bernard de Winter (31 July 1924 - 8 May 2017 Pretoria) was a South African botanist who from 1973 was Director of the Botanical Research Institute, which later became the National Botanical Institute and then the South African National Biodiversity Institute. He is commemorated in Kirkia dewinteri, Aloe dewinteri, Silene dewinteri and other taxa. The Pedaliaceae genus of Dewinteria is named after him, with the single curious species D. petrophila from the Kaokoveld in Namibia. The standard author abbreviation De Winter is used to indicate this person as the author when citing a botanical name.