The textbook "Gas Sensor: 1D-Semiconductor Metal Oxide Nanomaterials" offers a comprehensive analysis of the use of one-dimensional semiconductor metal oxide nanomaterials in gas sensing. It highlights the challenges and advancements in the detection of toxic gases, which are becoming increasingly relevant due to rising environmental pollution. The author, Akash Katoch, examines the properties of semiconductor oxide materials and their ability to detect both oxidizing and reducing gases. By analyzing the electrical conductivity of these materials, the book provides deep insights into the functioning of gas sensors. It also addresses the latest developments in the miniaturization and surface engineering techniques of nanostructures, which are crucial for enhancing sensor efficiency. This publication is aimed at professionals and students in the fields of mathematics, natural sciences, and engineering who are involved in the development and application of gas sensors.