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Underground hydrogen storage (UHS) is the injection of hydrogen into the geologic porous medium for subsequent withdrawal and reuse during off-peak periods to contribute to the energy mix. Recently, UHS has gained prodigious attention due to its efficiency for the storage of hydrogen on a large scale. Nonetheless, an adequate understanding of the storage process is required for efficient and safe monitoring and to preserve reservoir integrity. Herein, the hydrodynamics of injected hydrogen (H₂) gas, reservoir fluids, and reservoir rock systems are reviewed. Moreover, critical factors inherent to the reservoir (such as temperature, pressure, salinity, and rock mineralogy) that affect the UHS process are elucidated. Based on the available literature, the interplay of H₂ solubility, interfacial tension, wettability, adsorption, and diffusion properties influence the geologic storage process. Overall, this review provides …