The increased demand for metal and metal oxide nanoparticles has led to large-scale manufacturing of these nanoparticles employing high-energy pro¬cedures with diverse toxic solvents. This pollutes the environment, necessitating the use of environmentally acceptable “green” synthesis processes. Bio-resources, such as plants and plant products, bacteria, fungi, yeast, and algae, can be used to produce metal nanoparticles as an alternative. In comparison to other methods, “green” synthesis has low toxicity and is safer for human health and the environ¬ment, making it the best method for creating metal and metal oxide nanoparticles. Considering metallic oxide nanomaterials as promising materials, we provide a comprehensive review of studies on the diverse application and green synthetic method of metallic oxide nanomaterials using biological materials as reducing agents and stabilizers. This study extensively reviews the recent research on the synthesis mechanism of zinc oxide, silver oxide, and gold oxide nanomaterials and their diverse applications.

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