 Zinc oxide, ZNO, nanomaterials have become increasingly popular due to their unique properties, which make them ideal candidates for use in chemical sensors. These materials can be engineered into different shapes and sizes, allowing for greater control over their performance. Additionally, they exhibit high electrochemical activity and electron communication, making them suitable for use in electrochemical sensors. This review discusses the current advances in ZNO nanomaterial-based chemical sensors, including their operational factors such as size, morphology, composition, and their respective working mechanisms. It also examines the selectivity, sensitivity, detection limit, stability, and other important parameters. This article was authored by Savita Chaudhary, Ahmad Umar, KK Bussan and others.