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The Lanthanum loaded CuO (LCO) nanoparticles (NPs) were successfully synthesized by precipitationthermal decomposition method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive spectra (EDS), diffuse reflectance spectra (DRS), photoluminescence (PL), X-ray photoelectron spectroscopy (XPS) and BET surface area measurements. 10 The synthesized LCO NPs was used as nanocatalyst for the synthesis of 1, 4-disubstituted-1, 2, 3-triazoles by click reaction of substituted benzyl azides and alkynes and synthesis of propargylamines via threecomponent coupling reaction of aldehydes, alkynes and amines under ultrasonication. One-pot operation, atom-economical nature, regioselectivity and good yields are the noteworthy features of this protocol. The reusability of the prepared nanocatalyst was successfully examined six times without any appreciable loss 15 in catalytic activity.