Zinowiewia madsenii is a species of plant in the family Celastraceae. It is endemic to Ecuador. Its natural habitat is subtropical or tropical moist montane forests. It is threatened by habitat loss.
Zinowiewia madsenii are densely branched shrubs or trees that can reach up to 15 meters high. It has coriaceous leaves which are 1.8 to 3 cm long and 1.4 to 1.8 cm wide. It has green flowers with 5 petals. Its samaras are light green, 14 to 19 mm long, and 4 to 7.5 mm wide.