AneuRisk65: a dataset of three-dimensional cerebral vascular geometries. We describe the AneuRisk65 data, obtained from image reconstruction of three-dimensional cerebral angiographies. This dataset was collected for the study of the aneurysmal pathology, within the AneuRisk Project. It includes the geometrical reconstructions of one of the main cerebral vessels, the Inner Carotid Artery, described in terms of the vessel centreline and of the vessel radius profile. We briefly illustrate the data derivation and processing, explaining various aspects that are of interest for this applied problem, while also discussing the peculiarities and critical issues concerning the definition of phase and amplitude variabilities for these three-dimensional functional data.