The workshop Quantum Designer Physics will highlight recent advances in material systems purposefully designed for studying some of the most intriguing physical phenomena at the nanoscale. Very broadly these phenomena are related to spin, topology, and coherence, which enable the materials display quantum functionalities. Condensed Matter Physics is known for providing a rich variety of material systems in which different physics can be found and studied. With the recent development of quantum materials, it appears to be possible to devise the physics and implement a suitable material system for that physics on demand. This workshop brings together the leading experts working on quantum materials and aims at creating a stimulating atmosphere for discussing new physics on the marvelous sites of San Sebastian. We will discuss recent progress in creating ordinary and topological quantum systems in different dimensions as well as some of the most exotic quantum materials based on graphene and other n-dimensional materials. We will update on the progress in spin-based quantum computing with a look into the prominent future of quantum technologies. The quest for Majorana bound states in hybrid superconducting systems and topological quantum computing are also on our agenda. We hope the workshop will foster collaborations and inspire its attendants to tackle new problems with great ideas which make a difference for fundamental physics, lead to applications, and advance futuristic technologies.