  The most recent results of the top-quark mass measurements with the ATLAS
detector using data collected from proton-proton collisions at the Large Hadron
Collider are presented. Although several decay modes of the top-quark pairs
have been used in ATLAS for top-quark mass measurements, only the latest
results are presented (single lepton and dilepton channels). The top-quark pole
mass from the $t\overline{t}$ cross-section measurement in the dilepton channel
and the top-antitop mass difference measurement in the single-lepton channel
are also shown. The systematic uncertainties associated to these measurements
are discussed in some detail.
