Copper is a metal which is cheap and more abundant in nature can be harnessed for many applications. The present work reports the green synthesis of copper nanoparticles (Cu NPs) from an extract of Azadirachta indica (Neem) leaves as reducing/stabilizing agent. The morphology and stability of the green synthesised Cu NPs were investigated by FESEM, FTIR and UV-Visible spectroscopy. FESEM images confirmed the formation of monodisperse and highly crystalline Cu NPs which are nonhomogeneous in particle size and shape. The formation of copper nanoparticles was confirmed by UV-Vis absorption spectroscopy showing maximum absorption peaks between 615-630nm and FTIR showed the presence of biological molecules responsible for reducing Cu+ ions. Different concentrations of aqueous copper sulphate salt were taken maintaining the concentration of the leaf extract and concluded that the concentration of copper sulphate salt does not play a major role in the formation of the nanoparticles. The green synthesised Cu NPs were stable for a long time.