Olefination is the most important class of reaction in synthetic organic chemistry due to its wide range of applicability. Furthermore, zinc oxide nanoparticles (nano ZnO) serve as highly efficient catalysts. The current protocol offers an efficient method for the olefination of various aldehydes utilizing ZnO nanoparticles as catalysts in distilled water, providing a green reaction medium. Additionally, ultrasonication (US) is used as a green source of energy to accelerate the reaction.