“Frontiers of Condensed Matter” is a series of doctoral training sessions organized since 2010 by a number of European partners. It aims at offering final year Master students and junior PhD-students (1st/2nd year) a high-level training program in the general area of condensed matter physics. The program is not focused on a specific subfield. Instead it tries to give a broad introduction to important concepts in condensed matter physics. Topics include, e.g., quantum transport, quantum materials, superconductivity, topological phases, cQED, open quantum systems, and quantum device physics.