Polyaniline (PANI) and metal oxides are two materials that have various applications, including active sensors. PANI provides several benefits over other conductive polymers, including ease of synthesis, affordability, and high conductivity. Depending on the benefits of PANI, here we report the fabrication of PANI/metal oxide composites as an active material for gas sensors, especially LPG. By oxidatively polymerizing aniline at room temperature, PANI was formed. PANI/metal oxide composites were produced by using an in-situ polymerization technique. The PANI/MgO and PANI/ZnO nanocomposites were successfully fabricated, as shown by FTIR and XRD characterization results. The sensitivity of PANI/metal oxide nanocomposites to LPG has been proven. The result shows that PANI/metal oxide sensitivity is better than barePANI/MgO, which is one of the kinds of metal oxide used. Several concentrations of gas were used at low ppm: 50, 100, and 200 ppm to identify the sensitivity of PANI. The size of the pores with a radius of 285 Ă of the PANI/MgO nanocomposite shows that the value sensitivity was improved. The PANI/MgO nanocomposite has the best sensitivity to LPG exposure because it works well at all concentrations.