Cerium dioxide (CeO2) was successfully densified in a single step by the cold sintering process at temperatures up to 400℃ under 500 MPa, using molten hydroxides flux solvents. The CeO2 ceramics obtained were 82 to 91 % of the theoretical density, with nanograins ranging from 33 ± 8 nm to 68 ± 22 nm. It was also observed that the amount of residual fluxes was more important on surfaces of as-cold sintered samples compared to the bulk and that pores were not areas of preferential segregation. XRD analysis highlighted the increased crystallinity of CeO2 with the sintering temperature. Electrical conductivity measurements were used to evaluate the activation energy for grain conductivity of 0.49 eV, highlighting spectra characteristic of nanoscale CeO2.