The Ni-based superalloy, Hastelloy X, holds the potential to be employed as a structural material in diverse specialized applications that require a simultaneous combination of high strength, remarkable oxidation resistance, and superior corrosion resistance at elevated temperatures. It is crucial to look at the oxidation behaviour at high temperatures in order to evaluate the material’s suitability for such applications. In the present work, cyclic oxidation method was adapted to investigate the oxidation behaviour of Hastelloy-X at 1223 K in ambient air for different durations ranged between 0.5 and 18 h. The oxidation kinetics of this alloy approximately follows a parabolic rate law. The morphologies and composition of oxide scales developed on the alloy was characterized using scanning electron microscope (SEM). Identification and characterization of the oxide films formed on the alloy surface were also carried out using multiple advanced techniques such as X-ray diffraction (XRD) and Raman spectroscopy. NiCr2O4 was also seen to develop after prolonged oxidation, in addition to Cr2O3.