The past decade has witnessed substantial growth in research interests and progress in the area of hydraulic fracturing for effective reservoir stimulation, driven mainly by the boom in unconventional resource exploitation. Despite the astounding progress that has been made in understanding the mechanics of hydraulic fracturing in rocks, some fundamental mechanisms are yet to be understood and applied in practice. Numerical modeling is a vital tool to investigate the coupled hydro-mechanical processes in rock masses. In recent years, great efforts were made in both academia in industry to develop various fracture models that are suitable for hydraulic fracturing in unconventional reservoirs. We thus believe that it is beneficial to provide a platform of information and knowledge exchange on the frontier scientific research in hydraulic fracture modeling. We welcome all contributions that advance understanding of hydraulic fracture modeling as well as target practical applications.