HAPS Collaboration (Hadron and Partonic Structure Collaboration) is a research collaboration focused on precision QCD studies of hadron and partonic structure. Its scientific program includes global analyses and phenomenological investigations of unpolarized and polarized parton distribution functions, fragmentation functions, spin-dependent observables, and the impact of present and future measurements, particularly those relevant to the Electron-Ion Collider. The collaboration aims to advance a more quantitative understanding of hadron structure by combining modern theoretical frameworks, data-driven methodologies, and precision phenomenology.