High Precision X-ray Measurements 2023 conference is the third edition of the HPXM workshop, held at the INFN Laboratories of Frascati in 2018 and 2021.In the wake of the success of the 2018 and 2021 editions, HPXM2023 is planned with the twofold aim to consolidate the existing interconnections between the research teams and foster creating new ones, offering the opportunity for all the participants to discuss and share the results of their activities focusing on a common protagonist: X-ray precision detection.The aim of this workshop is to inform the participants on the most recent developments in X-ray detection technologies and their possible impacts in various sectors like nuclear physics, astrophysics, quantum physics, XRF, XES, EXAFS, PIXE, plasma emission spectroscopy, monochromators, synchrotron radiation, radioprotection, telescopes and space engineering, medical applications, food and beverage quality control and elemental mapping.The scientific program consists of invited lectures from distinguished scientists and oral presentations given by the participants.Organizing Committee:A. Scordo, Laboratori Nazionali di Frascati INFN, ItalyF. Napolitano, Laboratori Nazionali di Frascati INFN, ItalyA. Tamborrino Orsini,  Secretariat