Plant extracts mediated synthesis of metal oxide nanoparticles has been developed to minimize the toxic and harmful impacts of chemical and physical methods. The present study is a green approach to synthesize zinc oxide nanoparticles (ZnO NPs) from the aqueous extracts of aerial parts of Hibiscus rosa-sinensis. Zinc nitrate hexahydrate (Zn(NO3)2.6H2O) was used as a precursor and the extracts of leaves, stem segments and flower petals were used for the reduction of zinc oxide nanoparticles. The resulted reaction mixture with zinc colloids were characterized using UV-Visible spectrophotometric analysis. The absorbance peak was obtained at 300 nm, 291 nm and 293 nm for leaf, stem and flower petals respectively. This is an eco-friendly approach for quick scale up of ZnO nanoparticles from H. rosa-sinensis and it can be performed at room temperature.