Henk Jaap Beentje (born 1951, Bakkum) is a Dutch botanist.
He obtained his PhD at the Wageningen Agricultural University on the thesis A monograph on Strophanthus DC.
Since 1995, Beentje has been a researcher at the herbarium of the Royal Botanic Gardens, Kew.
He is particularly engaged in research of mainly African species from the Composite and the Palm families.
Beentje also serves as an editor of the publication series Flora of Tropical East Africa.