All along this lecture we will argue the benefits of integrating structural geology into rock engineering. Despite ISRM’s recommendations, we will also expose the very low percentage of tunnelling or dam projects involving structural geologists and more generally the widespread lack of structural geology expertise in civil and rock engineering projects, its consequences and associated missed opportunities. Standard geological studies are usually not enough to provide adequate level of details and quantitative assessments but this can be done with structural geology which allows us for instance to link fractures’ geometry, stress conditions and hydraulic conductivity no matter the scale, from small (e.g. a tunnel face), to large (e.g. full site). We will provide a suite of concrete examples coming from real-world site investigations, from design to construction, in order to illustrate these major benefits of structural geology in rock engineering. Structural geology is too often reduced to the manual or remote measurement of fractures to elaborate stereonets and distinguish fracture sets, frequently without any overarching assessment of the structure of the site in question. Whilst the use of structural geology is widely accepted and developed in oil & gas industry, especially during investigatory studies, it is not so in civil and rock engineering projects. One explanation is that engineers struggle with geological observations and the establishment of a diagnostic based upon too few or incomplete sets of data. One way to overcome this challenge is to build multi-disciplinary teams with both structural geologists and rock engineers which brings a plurality of perspectives and complementary skillsets. However, hiring both structural geologists and rock engineers will usually increase costs which may explain why it is not often considered. More important, during the last decades there has been a real decline in structural geology university courses around the world, supplanted by “new” disciplines often linked to the environment, so that even when the need for structural geology is understood, geologists with the right training and skillset are not always available. Whilst the ISRM could be more vocal about its recommendation to use structural geology in industrial and research projects, it cannot on its own change our mindsets. Consequently, we argue that individuals also have a responsibility to promote and embed structural geology in all rock engineering projects, from industry to research projects. We show one way forward on how this can be done, on the job or at industry and academic events.