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Abstract Concerns about indoor and outdoor air quality, industrial gas leaks, and medical diagnostics are driving the demand for high‐performance gas sensors. Owing to their structural variety and large surface area, reducible metal oxides hold great promise for constructing a gas‐sensing system. While many earlier reports have successfully obtained a sufficient response to various types of target gases, the selective detection of target gases remains challenging. In this work, a novel method, low‐frequency noise (LFN) spectroscopy is presented, to achieve selective detection using a single FET‐type gas sensor. The LFN of the sensor is accurately modeled by considering the charge fluctuation in both the sensing material and the FET channel. Exposure to different target gases produces distinct corner frequencies of the power spectral density that can be used to achieve selective detection. In addition, a 3D vertical‐NAND flash array is used with the fast Fourier transform method via in‐memory‐computing, significantly improving the area and power efficiency rate. The proposed system provides a novel and efficient method capable of selectively detecting a target gas using in‐memory‐computed LFN spectroscopy and thus paving the way for the further development in gas sensing systems.