Physical phenomena of quantum origin at the nano- and micro-scale such as the Casimir-Lishitz interaction and radiative Heat Transfer, are at the heart of many fluctuation-induced interactions in biology, chemistry, environmental science, and physics, amongst others, presenting important potential applications in various technologies. This fact makes this field impressively interdisciplinary, involving fundamental and applied knowledge in various subjects, including solid-state physics, material science, soft matter, quantum physics, astrogeophysics, and chemistry, nanomachinery, and high precision detection techniques. Forces at the nanoscale are crucial in bioassembly of viruses or gas hydrates self-preservation, for instance, and are also responsible for superlubricity, adhesion, and stiction in micro- and nano-electromechanical (MEM and NEM) devices like switches and accelerometers. Nanoscale radiative transfer of energy is essential to various technologies, including heat-assisted magnetic recording, near-field thermophotovoltaics, and lithography, amongst others. This mini-colloquium aims to embrace interdisciplinary fields with a common physical origin, providing a framework in which leading scientists from apparently disparate fields can share expertise and cross-fertilise the research fields towards deeper insight and application advances, interchanging ideas and promoting interdisciplinary collaborations. This mini-colloquium deals with recent advances in quantum electrodynamics and light-matter interaction at the nano- and micro-scale, especially focusing on Casimir-Lifshitz interactions, radiative Heat Transfer, and related topics. Interests will cover both experimental approaches and novel theoretical descriptions for measuring and describing related quantum electrodynamic phenomena and their potential implications in fundamental aspects and technological applications.