Four new species are described from Brazil for the sundew genus Drosera (Droseraceae): Drosera tentaculata F.Rivadavia spec. nov., D. grantsaui F.Rivadavia spec. nov., D. camporupestris F.Rivadavia spec. nov., and D. viridis F.Rivadavia spec. nov. The morphological characters distinguishing these from other similar or related tax are discussed together with habitat information, detailed illustrations, and distribution maps. Drosera grantsaui and D. viridis are included in subgen. Drosera sect. Drosera, whilst D. tentaculata and D. camporupestris are included in subgen. Drosera sect. Oosperma. Furthermore. D. chrysolepis Taubert and D Oosperma. Furthermore, graminifolia A.Saint-Hilaire are moved from sect. Drosera to sect. Oosperma.