The transition of the global energy mix toward affordable and cleaner energy has boosted the utilization of biomass feedstock as an energy source. Among the various technologies for biomass conversion, torrefaction is a very modern thermochemical process utilized to improve its fuel properties, making it suitable for gasification and power generation applications. Although the process of torrefaction enhances the carbon content and heating value, the resultant product possesses a higher ash content. The higher ash content in the fuel reduces combustion efficiency and contributes to slag formation within the reactor due to ash melting. Hence, in this experimental investigation, acid/alkali leaching of the torrefied rice husk (TRH) was performed to reduce its ash content, improving its overall fuel properties. The torrefied rice husk was prepared in an inert atmosphere under suitable operating conditions, and the samples were treated using HCl and NaOH at different concentrations and residence times. The treated samples were washed thoroughly and dried for successive analysis. Several characterization techniques, such as proximate analysis, ultimate analysis, higher calorific value, FTIR, XRD, fiber analysis, and FESEM, were performed to investigate the optimum leaching conditions. From the analysis, it has been witnessed that acid leaching was sufficient to remove the majority of the ash content. Hence, to reduce the severity of the treatment condition and cost, acid leaching of TRH using 0.1 N HCl for a 30 min residence time has been suggested as the optimum treatment condition for ash removal for its successive utilization in various thermal processes.