The book "Thermo-Hydro-Mechanical-Chemical Processes in Fractured Porous Media: Modelling and Benchmarking" offers a comprehensive collection of benchmarks and examples related to the mechanics of porous media, compiled over the past two years. It builds on the benchmarks published in 2014 and addresses a variety of applications in the geosciences, geotechnics, geothermal energy, and geological waste disposal. The analysis of thermo-hydro-mechanical-chemical (THMC) processes is crucial for numerous applications in environmental engineering, including geological waste disposal, geothermal energy utilization, carbon storage and capture, and water management. The book emphasizes the importance of process-based modeling to quantify future scenarios and assess the safety of geotechnical applications. It demonstrates that benchmarking is a suitable methodology for verifying the quality of modeling tools and promotes collaboration within the scientific community.