The 6th International Conference on Geotechnical Research and Engineering (ICGRE'21) aims to become the leading annual conference in fields related to Geotechnical Engineering. The goal of ICGRE'21 is to gather scholars from all over the world to present advances in the relevant fields and to foster an environment conducive to exchanging ideas and information. This conference will also provide an ideal environment to develop new collaborations and meet experts on the fundamentals, applications, and products of the mentioned fields. ICGRE'21 is an acronym for International Conference on Geotechnical Research and Engineering. Topics for ICGRE’21 include, but are not limited, to the following: Dams and Tunnelling Engineering Geology Geoenvironmental related topics Geohazards and Risk Assessment Geotechnical Infrastructure Geosynthetics and Geoproducts Marine Geotechnics Mining and Geotechnics Design and Modelling Soil and Rock Mechanics and Characterization Transportation Geotechnics, Engineering and Technology